Zenith 18.5''' NVSI
Example movement: Zenit 18.5''' NVSI, number: 1 659 433 (aprox: 1910), 15 jewels, negative winding/setting mechanism, excenter regulator.
Technical data: Zenith cal: 18.5'''
- 15 jewels, manual wind, sub second.
- Size: 18.5''' 41.30 mm.
- H: = 6.80 mm.
- N: = 18.000 A/h.
- Power reserve: 30 h.
- Mainspring: 2,00 x 16,5 - 0,20 - 500 AT = Double brace and hole.
Versions:
- 18,5''' open face caliber.
- 18,5''' hunter caliber.
- 18,5''' NVSI: open face caliber, negative wind/setting mech.
- 18,5''' NVSI: hunter caliber, negative wind/setting mech.