Mainspring Watch Service Part For SEIKO Movement Cal. 341, 6105, 6117, 6139, 6309, 7S26, Barrel Complete, etc.

If you are having your watch serviced, do yourself a favour and change the mainspring as part of the service; the mainspring is probably one of the most important parts in a mechanical movement. If your watch does not yet need a service, keep one for future use, as these are getting harder and harder to find. You WILL need it at some point and it will greatly extend the life of your watch and also its accuracy. Brand new and sealed mainsprings for SEIKO calibers. Mainsprings are made by Generale Ressorts (Switzerland) and Complete Barrels are made by SEIKOSHA (Japan). Choose from the list of calibers in the listing. Please note that I do not accept return for parts. Feel free to contact me for whatever questions you might have.

N.B. These mainsprings are produced in Switzerland by Generale Ressorts, one of the biggest (if not the biggest) and most reputable mainspring manufacturers in the world. Mainsprings are an extremely delicate and difficult to produce item that is almost always outsourced by watch companies, even by the ones that have their own, in-house movement manufacturing facilities. The sleeve that mainsprings are packaged in, is unbranded and will not bear any insignia or logo of the brand it is intended for. The photo you see in the listing is a generic photo of a mainspring to help everyone understand what part they are ordering and it is for presentation purposes only.