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IWC cal 851 --> 854 / 8521 --> 8541
IWC setting lever spring cal. 8521 8531 8541 / part 854126 61.090.00 = 445
29.9 EUR
Same part for following calibers : IWC 8521 8531 8541
Setting lever spring Part 85 41 26 (445)
Neuf de stock / New old stock (very minor scratch, not visible on pics, but it looks to be never used)