Certina 23-20
The Certina 23-20 was modified during production with the same caliber number, the pictured movement have screw balance, later production have flat balance ring and adjustable stud carrier.
Technical data Certina 23-20
- 15/17 jewels, manual wind, sub second.
- Size: 10.5''' 23.30 mm.
- H: = 3.60 mm.
- N: = 18.000 A/h.
- Power reserve: 50 h.
Versions:
- 23-20: 18.000 A/h, sub second.
- 23-30: 19.800 A/h, sub second.
- 23-35: 18.000 A/h, center second.
- 23-36: 19.800 A/h, center second.