FEF 251
Mechanical
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Notes
differences not known between 250-253, 255, 260
Dimensions
| Width | 19.4 lignes (43.76 mm) |
|---|---|
| Height | 3.55 mm |
| Stem height | 1 mm |
| Hands (H × M × S) | 1.3 × 0.6 × ? mm |
Technical data
| Beat rate | 18,000 vph (2.5 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 47 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | No |
|---|---|
| Date | No |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | GR4455 |
|---|---|
| Height | 1.6 mm |
| Thickness | 0.09 mm |
| Length | 260 mm |
| Barrel diameter | 7.5 mm |