New York Standard size 12 mainspring. The original company's part number is #4144.
1 Item Items
In stock now
Warning: Last items in stock!
These are "new-old-stock" springs and will need to be cleaned (lighter fluid works well) before installation. These are getting hard to find and I have a very limited supply with no guarantee that I will be able to replenish them when gone. I highly recommend that you purchase the one you need now if I have it in stock