Certina 15-20

• 32 jewels (oscillating weight with ruby ball bearing), automatic wind.
• S: = 6.75  15.30 mm.
• H: = 4.70 mm.
• N: = 19.800 A/h.
• Power reserve: --

Versions: Certina

• 15-20:     6.75''' 19.800 A/h.
• 15-21:     6.75''' 21.600 A/h.
• 17-211:   7.75''' 21.600 A/h.
• 17-221:   7.75''' 21.600A/h, date, new balance.

Versions: Longines

• 470: = Certina 15-20.
  
• 472: = Certina 15-21.