Vintage chronograph watch calibers Hahn 13 3/4 ligne Hahn 48/50 chronograph replacement mainspring made by Onyx in Switzerland. Auction is for one (1) part. New Old Stock made in Switzerland part that comes in the envelope shown. This mainspring is not pre-wound you will need to use a mainspring winder to install it. You should have your watchmaker change the mainspring at servicing time. Savvy vintage watch collectors know to snap up spare mainsprings like this when they come available to provide it to their watchmaker and save. Check our feedback of more than 16,000 positives and buy with confidence with a seller on EBAY since 1998 and a member of the NAWCC watch collector's association since 1997.

The Squinky vintage watch shop is also one of the largest sellers of vintage watch movement repair parts on EBAY with 1000+ parts listed here for all of the major old watch brands that collectors like.