- Master of Time
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https://www.watchtime.com/seiko-automat ... raph-1969/
Three automatic chronograph watches were released in 1969. Without a doubt, the one with the most lasting impact was the Seiko Caliber 6139. The combination of the compact automatic winding mechanism with a vertical clutch for more precise stopwatch measurement and a column wheel, which became widespread among high-end chronograph watches, is still favored by many watchmakers today.
No talk of 1969 would be complete without mentioning the Caliber 6139. This revolutionary movement had a fascinating background and a lasting influence.