Zenith 18.5''' , Winding stem, DCN: 608
- DCN no: 608
- Thread: 150
- Fits cal: cal: 18.5''' NVS Bas VS: Lépine and savonette, no engraved cal. no.
- A: = 107
- B: = -
- C: = 170
- D: = 150
- F: = 946
Versions with positive setting mechanism..
- 18-28-3A: Breguet hair spring.
- 18-28-3A-6: Pare-chocs.
- 18-28-3P: Breguet hair spring.
- 18-28-3P-6: Pare-chocs.
- 18-28-3P-7: Breguet hair spring, swan neck regulator.
Versions with negative setting mechanism, nouveau
- 18-28-1T: Lépine.
- 18-28-3T: Lépine.
- 18-28-2T: Savonette.
- 18-28-4T: Savonette.
- 19-28-1T: Lépine grandeur 19'''
- 18-28-2T: Savonette grandeur 19'''
Versions with negative setting mechanism, ancien
- 18.5''' NVS Bas VS: Lépine and savonette, no engraved cal. no.