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What you're talking about is a Film Leader. Originally, a frame was inserted once every 16 frames (16 frames per foot for 35mm film) with numbers marked 11 to 3. At some point in the mid 1960's that was changed to a continuous countdown with a new number every second (time interval as opposed to length interval) that ran backwards from 8 to 2. If you google "Film Leader Countdown", you should be able to find a number of examples on YouTube and Vimeo.
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