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IWC cal 851 --> 854 / 8521 --> 8541
IWC ratchet wheel cal. 851 852 853 854 8521 8531 8541 / part 31.020.00 = 415
15.9 EUR
IWC ratchet wheel / rochet
Same part for all following IWC calibers : 851 852 853 854 8521 8531 8541
Ratchet wheel part 31.020.00 / 415
Pre-owned , signs of use and discoloration, see pics