Longines mainspring 18.89M 17.89M

1 Longines mainspring / Ressort de barillet / Zugfeder

 Only for 17.89M and 18.89M ( not for 17.89 nor 17.89ABC nor 18.89 nor 18.89ABC nor 18.89N , height is different)

Height : 1.50 mm

New old stock / neuf de stock - The packet was factory sealed, I have just opened it in order to make pictures