Seiko Prospex Speedtimer Mechanical Chronograph
2021-9-29u2002·u2002The original Seiko Speedtimer released in 1969 with automatic calibre 6139. Not only was it a pioneering movement, but the calibre 6139 was the only one equipped with a column wheel and vertical clutch – two devices that delivered real improvements in the measurement of elapsed time in a wristwatch and that are still considered today as the best possible architecture.
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