One wouldn't think the old frame, with its cracked glass face and wrapping paper-esque backing, would protect a 250-year-old letter so well through the years. The letter remained near pristine condition, its swirling "S" and curly "C" script now clearly discernible behind a new frame and glass. Dated Feb. 23 of the revolutionary year, it grants power of attorney from John Eastman of Salisbury, Mass. to his son, Richard, a Blacksmith living in Concord.