Seiko 6139B, Automatic framework with ball bearing, no: 903463
- Used SEIKO original part in very good condition. Picture shows the actual part.
- Part no: 903463
- Fits cal: 6139B
Technical data: SEIKO 6139B
- 17 jewels, automatic wind, chronograph, 60 s, 30 min counter, day-date.
- S: = 27.0 mm.
- H: = 8.0 mm.
- N: = 21.600 A/h.
- Power reserve: 45 h.
Versions:
- 6138A: 21 jewels.
- 6138B: 21 jewels, modified switch mechanism.
- 6139A: 21 jewels, without 12 h counter.
- 6139B: 17 jewels, without 12 h counter, modified switch mechanism.