New York Standard size 10 mainspring. The original company's part number is #7080. "Tongue End"
The dimensions are:
Dennison: 6 1/2 X 4 1/2 X 17
Metric: .155mm X .0185mm X 43.18mm
3 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