Mido 917RC
Mechanical
c. 1954
Self-winding (rotor)
Date
No photos yet
Notes
1954-1960
exclusively for Mido with base plate of the AS 1131/1132
like 917PC, but extra quality
later samples with bigger date (cf. 917PC)
Incastar regulator:
The only large-scale produced regulator featuring a free oscillating hairspring. The end of the spring is fixed between two rollers, adjusting actually its length (Fig.2, 3). No isochronism error by the gap between the regulator pins.
Dimensions
| Width | 27.3 lignes (61.58 mm) |
|---|---|
| Height | 6.6 mm |
| Stem height | 1.9 mm |
| Hands (H × M × S) | 1.3 × 0.84 × 0.21 mm |
Technical data
| Beat rate | 18,000 vph (2.5 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 41 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | Rotor |
|---|---|
| Date | Yes |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | Zf931 |
|---|---|
| Height | 8 mm |
| Thickness | 0.09 mm |
| Length | 250 mm |
| Barrel diameter | 1.35 mm |