Seiko 6138B
Mechanical
c. 1972
Self-winding (rotor)
Date
Day
Chronograph
No photos yet
Notes
1972-1979
sophisticated excenter self-winding mechanism with just one gear stage (Fig.4)
like 6138A, only minor modifications of switching mechanism (dial side)
An old archive entry contains a sample with 17 jewels (after signature), but it is not sure whether the rotor bridge of this sample was swapped.
Dimensions
| Width | 27 lignes (60.91 mm) |
|---|---|
| Height | 8 mm |
| Stem height | — |
| Hands (H × M × S) | 1.5 × 0.9 × 0.26 mm |
Technical data
| Beat rate | 21,600 vph (3 Hz) |
|---|---|
| Lift angle | 54 ° |
| Power reserve | 45 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | Rotor |
|---|---|
| Date | Yes (quick set) |
| Day | Yes (quick set) |
| Hacking | No |
| Chronograph | Yes |
Mainspring
| GR code | — |
|---|---|
| Height | — |
| Thickness | — |
| Length | — |
| Barrel diameter | — |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | Seiko |
| Year | c. 1972 |
| Family | — |
| Clone of | — |
Documents
None
Updated 7 days ago · 0 revisions