![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 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](https://pbs.twimg.com/media/DTH1jASW0Ag0kMZ.jpg:large)
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
![Chasing my tail: Fault-detection and diagnosis in a Seiko 6139B | Adventures in Amateur Watch Fettling Chasing my tail: Fault-detection and diagnosis in a Seiko 6139B | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2019/04/6139-deconstructed.jpg)
Chasing my tail: Fault-detection and diagnosis in a Seiko 6139B | Adventures in Amateur Watch Fettling
![Seiko vintage chronograph, 6139-8002, mint with Lapinist service for $1,609 for sale from a Private Seller on Chrono24 Seiko vintage chronograph, 6139-8002, mint with Lapinist service for $1,609 for sale from a Private Seller on Chrono24](https://cdn2.chrono24.com/images/uhren/27962050-2nan1k4iudgkpy06iulblytx-ExtraLarge.jpg)