Extension spring used on early Williams 50 step unit assemblies and others.
Reference:
- 10A-224
- 10A-242
- 10A-227
- 10A-228
- C-6510 non-resetting 50 step unit with bell
- C-6510A non-resetting 50 step unit without bell
- C-6494 resetting 50 step unit
0.5
oz