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Darren Thomson on Twitter: "Next Watch project.. Service and rebuild a Seiko 6139 chronograph movement from 1971.. One of the 1st automatic chronographs in history.. https://t.co/WRUXgzGQ0R" / Twitter
Vintage Seiko 6139-6012 Bruce Lee Service | WatchCrunch
Vintage Seiko 6139-6012 Bruce Lee Service | WatchCrunch
Seiko 6139 Repair And "restoration" - Your Walkthroughs and Techniques - Watch Repair Talk
Seiko 6139 Service Tutorial Part 1 - Disassembly of The Calendar Works - YouTube
Chasing my tail: Fault-detection and diagnosis in a Seiko 6139B | Adventures in Amateur Watch Fettling