If you are having your vintage watch serviced, do yourself a favour and change the mainspring as part of the service. If your watch does not yet need a service, keep a mainspring 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 power reserve.
Brand new and sealed mainsprings for HANHART calibers. Swiss made. Manufactured from inox steel and ready to use as they are already greased. Choose from the list of calibers in the listing. Please note that we do not accept return for parts.
Feel free to contact me for whatever questions you might have.