Certina 28.10-721, Balance, complete

• CERTINA original balance in very good used condition.

• Fits cal: 28.10, 28.15, 28.151 with 18.000 A/h.

Data Certina cal: 28.10

• 17 jewels, manual wind, sub second.
• Size: 12.5''' 28.0 mm.
• H: = 3.75 mm.
• N: = 18.000 A/h.
• Power reserve: 46 h.

Versions:

• 28.10:   18.000 A/h, sub second.
• 28.15:   18.000 A/h, center second.
• 28-151: 18.000 A/h, center second, date.
• 28.16:   19.800 A/h, center second.
• 28.161: 19.800 A/h, center second, date.
• 28.163: 19.800 A/h, center second, date, circadian rhythm.