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50th Anniversary of the first automatic chronograph - Seiko's 6139 — Plus9Time
![Seiko] 6139 - First Automatic Chronograph movement - A piece of history!! Time to celebrate. : r/Watches](https://i.redd.it/wpq54eu0n0761.jpg "Seiko] 6139 - First Automatic Chronograph movement - A piece of history!! Time to celebrate. : r/Watches")
Seiko] 6139 - First Automatic Chronograph movement - A piece of history!! Time to celebrate. : r/Watches
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50th Anniversary of the first automatic chronograph - Seiko's 6139 — Plus9Time
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Seiko: A Chronograph Chronology | WatchTime - USA's No.1 Watch Magazine
