![ZENITH 30.5-401, Winding stem](http://urdelar.se/cdn/shop/files/0000_zenith_1_af64a99d-dd08-4562-9388-b8101fd67e11_{width}x.jpg?v=1695555707)
ZENITH 30.5-401, Winding stem
- ZENITH original stem, not in factory packaging.
- Thread: 0.90 mm.
- Fits: 30.5
Manufactured from 1973 - 1979
Data ZENITH cal: 30.5 (OMEGA 625)
- 17 jewels, manual wind.
- Size: 17.5 mm.
- H: = 2.5 mm.
- N: = 21.600 A/h.
- Power reserve: 42 h.
- Mainspring: 1.00 x 6.5 - 0.075