Certina 28-151, Center wheel with cannon pinion, no: 205, H: 2.42 mm.

• 
  NOS Certina original part in factory sealed packaging.

• 
  Cannon pinion height: 242

• 
  Fits cal: 28-151

Data Certina cal: 28-151

• 
  17 jewels, manual wind, center second, date.
• 
  Size: 12.5''' 28.0 mm.
• 
  H: = 4.90 mm.
• 
  N: = 18.000 A/h.
• 
  Power reserve: 46 h.
• 
  Mainspring: 1.40 x 11.5 - 0.125 - 360 mm.

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.