ETA 2640
Mechanical
c. 1971
No photos yet
Notes
1971-1980 (ETA 2650+2651+2658: 7574956)
Dimensions
| Width | 17.2 lignes (38.8 mm) |
|---|---|
| Height | 3.5 mm |
| Stem height | 1.15 mm |
| Hands (H × M × S) | 1.2 × 0.7 × 0.2 mm |
Technical data
| Beat rate | 21,600 vph (3 Hz) |
|---|---|
| Lift angle | 53 ° |
| Power reserve | 48 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | No |
|---|---|
| Date | No |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | — |
|---|---|
| Height | 1.32 mm |
| Thickness | 0.07 mm |
| Length | 340 mm |
| Barrel diameter | — |