Alloy Mainspring for 16s Waltham No. 2227 / 2267 (SA 710)

Unmarked Maker Swiss made Alloy Mainspring for 16s Waltham, Factory number 2227 / 2267 (SA 710), new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.