Wei Koh
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Articles by Wei Koh
Quadratic thermal radiation effects on hybrid nanoliquid flow near saddle and nodal stagnation points over a Howarth wavy cylinder using mass‑based thermophysical relations
Abstract Flows near saddle and nodal stagnation points possess applications in solar collectors, high-performance systems, drag reduction systems, and catalytic reactors. Motivated by these applications, the primary objective of the present study is to investigate three-dimensional stagnation-point flow of a hybrid nanoliquid over a sinusoidal wavy cylinder, with potential relevance to thermal management and heat-transfer systems involving boundary-layer transport phenomena.
Louis Vuitton Monterey Ceramic: Matthieu Hegi on the Return of a 1988 Icon
Stay in the loop, get updated with the latest. Your email address*: Email /* old video component */ ?> /* old video component end */ ?> Louis Vuitton returns to its very first wristwatch with the new Monterey Ceramic. Wei Koh sits down with Matthieu Hegi, Artistic Director of La Fabrique du Temps Louis Vuitton, for a closer look at two new ceramic interpretations of the unconventional design first created with Italian architect Gae Aulenti in 1988.
Inside BOVET’s Manufacture: How Haute Horlogerie Is Made
Stay in the loop, get updated with the latest. Your email address*: Email /* old video component */ ?> /* old video component end */ ?> The journey inside BOVET continues. After visiting the historic Château de Môtiers, Wei Koh travels to BOVET’s manufacture in Tramelan to discover the technical and industrial capabilities behind some of the house’s most ambitious creations.
The Complete Story of the Inclined Tourbillon | Masters of Chronometry EP 3
What happens when you take Abraham-Louis Breguet’s tourbillon and tilt it? In Episode 3 of Masters of Chronometry, Wei Koh and Constant Kwong trace one of the most fascinating and misunderstood branches of the tourbillon’s evolution: the inclined tourbillon. The story begins with a fundamental problem. A conventional tourbillon was conceived to average positional errors while a pocket watch sat vertically. But watches do not remain in one orientation.
The Angle of the Angels
The Saxon Angle: Walter Prendel Goes Further Between Andrew Potter’s inclined tourbillon, made in his Boston workshop circa 1860, and the next documented inclined tourbillon, there is a gap of approximately 70 years. The idea did not propagate. Nobody wrote it up. Nobody built on it. Breguet’s original flat cage became the industry standard in its essential geometry, and there it sat, largely unchallenged in its orientation, for the better part of a century.
Rolex, su futuro es complicado: Perpetual Padellone
Credits: Article and images by Wei Koh @ Revolution Watch Magazine. See the original article here - https://revolution.watch/mxl/rolex-su-futuro-es-complicado-perpetual-padellone/ En el mundo de los brindis festivos, mi favorito es el italiano “Cent’anni”, el deseo de que tú y los tuyos viváis cien años. Es precisamente en el centenario de su icónico Oyster donde la marca de relojes más poderosa que ha existido dirige la mirada simultáneamente hacia su pasado y hacia su futuro.
Rolex, su futuro es complicado: Perpetual Padellone
En el mundo de los brindis festivos, mi favorito es el italiano "Cent'anni", el deseo de que tú y los tuyos viváis cien años. Es precisamente en el centenario de su icónico Oyster donde la marca de relojes más poderosa que ha existido dirige la mirada simultáneamente hacia su pasado y hacia su futuro. Porque la nueva familia Perpetual Padellone de Rolex rinde homenaje a su venerado cronógrafo "Dato-Compax", la Ref. 8171 "Padellone" y la Ref.
Rolex Perpetual Padellone: A New Era of Complicated Rolex Watchmaking
Rolex has opened an entirely new chapter with the Perpetual Padellone. In this special video from Milan, Wei Koh and Constant Kwong look at the clues that pointed toward Rolex’s return to complicated watchmaking, before taking a first hands-on look at the watch itself. The Perpetual Padellone takes its name and much of its visual inspiration from the legendary Ref.
Rolex’s Future Is Complicated: The New Perpetual Padellone Family
Technical Breakdown of Rolex’s Annual Calendar Patent To walk us through this patent, I have asked Cheryl Chia, Revolution’s Technical Editor, to break down her findings. Rolex’s Ingeniously Compact Instantaneous Annual Calendar The guiding principle is to preserve the layout of Rolex’s complete calendars from the 1950s while upgrading the mechanism to an annual calendar, and naturally, the changeover must be instantaneous, as in the existing Saros annual calendar.
Unsteady reactive hybrid nanofluid flow between coaxial cylinders with variable transport properties and Einstein–Hamilton crosser model
Abstract This study investigates unsteady hybrid nanofluid flow between concentric stretched cylinders, incorporating homogeneous-heterogeneous (h–h) reactions. The SWCNTs/MWCNTs are selected as hybrid nanoparticles in a base fluid engine oil, with Newtonian heating at the inner wall. The shape factors of the nanoparticles were also considered, as they are important in the heat transfer rate of the system.
The Man Who Made Time His Own: George Daniels and the Birth of Independent Watchmaking
The Co-Axial Escapement: 24 Years from Idea to Wrist Daniels first conceived the Co-Axial escapement in 1975, and it stands, without exaggeration, as the most significant advance in portable mechanical timekeeping since Thomas Mudge patented the detached lever escapement in 1754.
Heat transfer and entropy analysis of shaped nanoparticles in stratified binary nanofluid flow over an exponentially curved Riga surface
Abstract The problem of controlling heat transmission and flow efficiency in advanced engineering systems, such as aerospace thermal management and next-generation cooling devices, is critically hampered by energy losses due to friction and thermal irreversibility.
The Bovet Family: Pascal Raffy on Craft, Integrity and the Human Hand
Stay in the loop, get updated with the latest. Your email address*: Email /* old video component */ ?> /* old video component end */ ?> Wei Koh sits down with Pascal Raffy, Owner and CEO of Bovet, for a thoughtful conversation on what it means to build a truly integrated high watchmaking manufacture. Filmed during a visit to Bovet’s manufacture, the discussion traces the decisive year of 2006, when Raffy’s vision for the maison expanded through Château de Môtiers and the manufacture in Tramelan.
Rare Finds & Hidden Grails: Inside Ponti Collection
Tucked away in Geneva is a quiet veteran of the vintage watch world. We visit Stan Ponti (@pontijunior), the second generation behind Ponti Collection, to explore more than two decades spent curating some of the world’s most important collections and, of course, to discover a selection of extraordinarily rare vintage timepieces. P.S Some of the pieces featured in this video may have already been sold, as it was filmed a few months ago.
The Bravest Watch in History: F.P. Journe’s Chronomètre à Résonance
On June 14, 2026, at Phillips New York, a watch sold for USD 13,922,000. It was an F.P. Journe Chronomètre à Résonance “Souscription, No. 007,” made around the year 2000. Nine minutes of bidding turned a watch estimated at more than USD 1 million into the most expensive watch ever sold by an independent watchmaker, and the most expensive watch of the 21st century ever sold at auction, full stop.
The Complete Story of the Multi-Axis Tourbillon
The Second Generation: New Voices, New Visions If 2004 was the year the multiple-axis tourbillon announced itself to the world through four near-simultaneous landmark debuts, the decade that followed saw the idea ripple outward — absorbed, reinterpreted, and in several cases radically reinvented by a new cast of watchmakers. Some were independents working alone at the bench in cities far from the Vallée de Joux.
Breguet Classique Chronométrie Ref. 7727: ¿El reloj mecánico más preciso del mundo?
Credits: Article and images by Wei Koh @ Revolution Watch Magazine. See the original article here - https://revolution.watch/mxl/breguet-classique-chronometrie-ref-7727-el-reloj-mecanico-mas-preciso-del-mundo/ Hace 21 años, cuando lancé la revista Revolution, cometí el error de afirmar que la razón de ser principal de un reloj mecánico de alta gama era conectar con su propietario a nivel emocional.
Breguet Classique Chronométrie Ref. 7727: ¿El reloj mecánico más preciso del mundo?
Hace 21 años, cuando lancé la revista Revolution, cometí el error de afirmar que la razón de ser principal de un reloj mecánico de alta gama era conectar con su propietario a nivel emocional. Mi razonamiento era el siguiente: establecí un paralelismo entre la llegada de la tecnología de cuarzo y la invención de la cámara fotográfica en términos de cómo cada una moldeó el desarrollo de la relojería y el arte.
Chopard L.U.C Quattro Revolution Re-edition
Credits: Article and images by Wei Koh @ Revolution Watch Magazine. See the original article here - https://revolution.watch/mxl/chopard-l-u-c-quattro-revolution-re-edition/ Dado a conocer en el año 2000 como su segunda gran apuesta en el panorama de la relojería contemporánea, el Chopard L.U.C Quattro Referencia 16/1863 fue uno de los primeros relojes de pulsera con una reserva de marcha de ocho días.
Chopard L.U.C Quattro Revolution Re-edition
Dado a conocer en el año 2000 como su segunda gran apuesta en el panorama de la relojería contemporánea, el Chopard L.U.C Quattro Referencia 16/1863 fue uno de los primeros relojes de pulsera con una reserva de marcha de ocho días. Lo notable es que Karl-Friedrich Scheufele, copresidente de Chopard, y su equipo lo lograron en una pieza de apenas 38 mm de diámetro y 9,54 mm de espesor.
Breguet Classique Chronométrie Ref. 7727: The World’s Most Accurate Mechanical Watch?
Twenty-one years ago when I launched Revolution magazine, I made the mistake of saying that a high-end mechanical timepiece’s primary raison d’être was to engage with its owner on an emotional level. My rationale then was as follows: I drew a parallel between the advent of quartz technology and the invention of the camera in terms of how each shaped the development of watchmaking and art.
Introducing the Chopard L.U.C Quattro Revolution Re-edition
Launched in 2000 as his second major salvo over the landscape of modern horology, the Chopard L.U.C Quattro Reference 16/1863 was one of the very first wristwatches with a power reserve of eight days. Remarkably, Chopard co-president Karl-Friedrich Scheufele and his team accomplished this in a timepiece that was a mere 38mm in diameter and just 9.54mm in thickness.
Rolex Certified Pre-Owned: The Quiet Revolution
One of the most important moments in watchmaking history happened quietly, one could almost say discreetly, in December 2022. This was the creation of Rolex Certified Pre-Owned, also known by its acronym, RCPO. Though he would likely prefer not to have attention drawn to him, this groundbreaking initiative was spearheaded by Rolex’s extraordinary CEO, Jean-Frédéric Dufour. The numbers speak for themselves: in just three short years, RCPO has risen to become a juggernaut.
My Take on the Louis Vuitton Watch Prize for Independent Creatives 2026
One thing interesting about the finalists of the second Louis Vuitton Watch Prize, held just days ago on March 24, is that the two strongest “young finalists” with genuine watchmaking background had already been recognized as winners of the F.P. Journe Young Talent Competition. This goes to show you how important Journe’s initiative is for talent-spotting watchmaking stars of the future.
Wei Koh, presidente del jurado del GPHG
En El Padrino, escuchamos su voz antes de ver su rostro. Las palabras que pronuncia encapsulan el significado completo de la película, entregadas con una economía poética casi zen. No hablo de Don Corleone, el personaje que da título al filme, sino de Amerigo Bonasera, el empresario de pompas fúnebres, el inmigrante, el forastero que triunfó. Dice: "Creo en América.
GPHG President of Jury: Wei Koh
In The Godfather, we hear his voice before we see his face. The words he says encapsulate the entire meaning of the film, delivered with a poetic economy that is almost Zen-like. I’m not talking about Don Corleone, the film’s titular character, but Amerigo Bonasera, the undertaker and immigrant, the outsider made good. He says, “I believe in America.
Louis Vuitton × De Bethune LVDB-03 Louis Varius Project
Credits: Article and images by Wei Koh @ Revolution Watch Magazine. See the original article here - https://revolution.watch/mxl/louis-vuitton-x-de-bethune-lvdb-03-louis-varius-project/ Marquen la fecha, 2 de febrero de 2026, porque Louis Vuitton ha presentado su colaboración con otra leyenda de la relojería independiente. Esta vez, es Denis Flageollet, de De Bethune.
Louis Vuitton × De Bethune LVDB-03 Louis Varius Project
Mark the date, February 2, 2026, for Louis Vuitton has unveiled its latest collaboration with another independent watchmaking legend. This time, it’s Denis Flageollet of De Bethune. What no one was expecting was that they decided not to create just a wristwatch, but the first modern pair of sympathetic clock and watch in horological history as a tribute to Louis Vuitton’s roots in travel. The result is absolutely sublime.
Revolution Awards 2025: Marca del año — Breguet y Vacheron Constantin - WR
Credits: Article and images by Wei Koh @ Revolution Watch Magazine. See the original article here - https://revolution.watch/mxl/revolution-awards-2025-marca-del-ano-breguet-y-vacheron-constantin/ Es un empate con dos ganadores para la Marca del Año, de los Revolution Awards 2025: Breguet, que celebró su 250 aniversario, y Vacheron Constantin, que marcó su 270 aniversario. Primero, Breguet.
Revolution Awards 2025: Marca del año - Breguet y Vacheron Constantin
Es un empate con dos ganadores para la Marca del Año, de los Revolution Awards 2025: Breguet, que celebró su 250 aniversario, y Vacheron Constantin, que marcó su 270 aniversario. Primero, Breguet. El nombre más famoso de toda la relojería es sin duda Abraham-Louis Breguet, el individuo que creó el primer reloj de carga automática, el primer repetidor de minutos con gongs de alambre, el tourbillon, y la primera pieza interactiva, la Sympathique.
Revolution Awards 2025: Brand of the Year - Breguet and Vacheron Constantin
It is a tie with two winners for Brand of the Year: Breguet, which celebrated its 250th anniversary in 2025, and Vacheron Constantin, which marked its 270th anniversary. First, Breguet. The most famous name in all of watchmaking is undoubtedly Abraham-Louis Breguet, the individual who created the first automatic-winding watch, the first minute repeater on wire gongs, the tourbillon, and the first interactive timepiece, the Sympathique.
Revolution Awards 2025: Leader of The Year - Laurent Perves
What is great about Vacheron Constantin today is that you can feel the entire manufacture unite behind their young but highly capable CEO Laurent Perves. And while he doesn’t like the limelight and is always self-effacing as a leader, modestly deferring to the “team,” this is a significant achievement unto itself. In the past, I’ve always professed a wariness of leaders that come from outside the watch industry, but Perves has proven to be a tremendous exception to this rule.
Revolution Awards 2025: Revolutionary of The Year - Gregory Kissling
If you had asked me before Greg Kissling took over as CEO of Breguet whether one individual could reposition this storied maison at the pinnacle of high watchmaking — capturing the essence of its legendary creativity in just one year — I would have said this task was near impossible. And I would have been completely wrong.
Revolution Awards 2025: Lifetime Achievement - Nicholas Foulkes
/* old video component */ ?> /* old video component end */ ?> Often, the phrase “he/she wrote the book on that” is used euphemistically. In the case of Nick Foulkes, however, it is meant literally: he penned the iconic, officially certified tome on Patek Philippe and has since written two factory-authorized books on Rolex — one on the Submariner and the other on the Datejust — with many more to come.
An Artistic Evolution
The watch you are looking at is the result of almost three years of collaborative back and forth with independent watchmaking legend Bernhard Lederer.
Long Live the Watch Nerds
The occasion of our 20th anniversary has given me pause to think about what Revolution should represent. Two decades ago, it was created to bring watches out of the doldrums of insular hobbyism — from the so-called Nerds’ table in the high school cafeteria to the Cool Kids’ table — while still retaining all their horological authenticity and technical veracity. Now I want to bring us back to the Nerds’ table. Why? Because in the past 20 years, we’ve had a rapid rise in watch lifestyle journalism.
The Revolutionary List: 24 Technically Brilliant Watches – the Breguet Expérimentale 1
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: François-Paul Journe
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. The reality is that history is littered with examples of brilliant watchmakers that were also terrible businessmen.
The Revolutionary List - 26 Inspirational Leaders: Jérôme Lambert
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Luigi “Gino” Macaluso
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. I believe I may have been one of the last people to speak to Luigi Macaluso.
The Revolutionary List - 26 Inspirational Leaders: Jean-Frédéric Dufour
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Louis Ferla
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Georges Kern
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. Georges Kern is a man that needs no introduction.
The Revolutionary List - 26 Inspirational Leaders: Cyrille Vigneron
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. I might get some criticism for saying “Cyrille Vigneron saved Cartier,” but I stand by the statement.
The Revolutionary List - 26 Inspirational Leaders: Thierry Stern
/* old video component */ ?> /* old video component end */ ?> This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Rolf Schnyder
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Theodore Schneider
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Karl-Friedrich Scheufele
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. I often joke that if Karl-Friedrich Scheufele didn’t exist, the watch industry would have had to invent him.
The Revolutionary List - 26 Inspirational Leaders: Angelo Bonati
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here.
The Revolutionary List - 26 Inspirational Leaders: Jean-Christophe Babin
This year, Revolution turns 20. Two decades of chronicling watches, people and ideas have given us a front-row seat to a remarkable story: how an age-old craft has both preserved its soul and reinvented itself for the 21st century. To celebrate, we’ve chosen over 100 names and milestones that, for us, define the era so far. From leaders to watches, you can see the whole list here. It’s easy to forget if you weren’t there.
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