FEATURES
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Chronograph
Complicated watch with a function for measuring short time periods in addition to its function for permanently displaying hours, minutes and seconds.
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Numbered edition
A watch series each of whose pieces is numbered sequentially in the order it is produced.
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Small seconds
A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.
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Tachymeter
A tachymeter is an instrument for measuring speed. It is a chronograph with a graduated dial on which speed can be read off in kilometres per hour based on 1000 meters distance.