Specifications
| Lignes | 12.25‴ |
|---|---|
| Mounting Diameter | 27.3 |
| Thickness | 4.1 |
| Frequency (vph) | 18,000 |
| Jewels | 15 |
| Power Reserve | 38 |
| Hand Sizes | 1.32, 0.72, 0.22 |
| Power | Manual |
| Shape | Round |
| Size | Medium |
Notes
12.91(P): open face, pin set
12.91: open face, set lever
12.91(SC): sweep second (open face), set lever
12.92(P): hunter, pin set
12.92: hunter, set lever
(all only stamped as 12.91 respectively 12.92)