DCVW on Instagram: "Seiko's 6139 automatic chronograph - a historical movement in its own right, like this serviced 1970 Seiko 6139-6019 here - was one of the first automatic chronograph movements created,
Seiko 6139 Chronographs Full List | Vintage Watch Inc
A Sailing Innovator's 1970 Seiko 6139 | Dc Vintage Watches
FS: Seiko 6139-6019 automatic chronograph, blue dial, never polished - $350 | WatchUSeek Watch Forums