Certina 13-20, Insetting for balance, upper & lower

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  CERTINA original parts in very good used condition.

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  Complete with insetting and cap jewel.

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  Fits cal: 13-20, 13-21, 13-22

Versions:

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  13-20: N: = 19.800, no mountings.
• 
  13-21: N: = 19.800, mounting threads.
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  13-22: N: = 21.600, mounting threads.