Certina 17-351, Ratchet wheel, no: 415

• 
  NOS original part. Not in factory packaging.

• 
  Fits cal: 17-351

Versions:

• 
  17-35: automatic.
• 
  17-351: automatic, date.
• 
  17-36: manual wind.
• 
  17-361: manual wind, date.