Zenith 1730-401, Winding stem
- ZENITH original stem, not in factory packaging.
- Thread: 0.90 mm.
- Fits cal: 1730, 1731, 1733, 1740
Data: Zenith cal: 1730
- 19 jewels, manual wind.
- Size: 7.75''' 17.20 mm.
- H: = 2.70 mm.
- N: = 21.600 A/h.
- Power reserve: 38 h.
- Mainspring: 1.10 X 6.5 - 0.085 - 200
Versions:
- 1730: no second, screw regulator.
- 1731: sub-second, screw regulator.
- 1733: center-second, screw regulator.
- 1740: no second, micrometic regulator.