Certina 23-20-401, Winding stem

• CERTINA original winding stem, not in factory packaging.

• Thread: 0.90 MM.
  

• Fits cal: 23-20

Data Certina caliber: 23-20

• 17 jewels, manual wind, sub second.
• Size: 10,5''' 23,3 mm.
• H: = 3.2 mm.
• N: = 18.000 A/h.
• Power reserve: 40 h.
• Mainspring:

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.