HR Mainspring A509 for 12s NY Standard Factory No. 4144 – Steel
USD 4.50 USD
Specifications
| Country Of Origin | Switzerland |
| MPN | A509 |
| SKU | PMA-HRA509S-09 |
| Type | Mainspring |
I likely have several of these so the one you get may differ slightly from the images. Images do a pretty good job of representing the item. Waltham Watch Material Catalogue 1909 edition - reprint. South Bend Watch Material Catalog Oct 1928 - reprint.