Marco Mainspring 231P for 12s Waltham 17j No. 2224A / 2279 - Alloy

Marco Mainspring 231P for 12s Waltham 17j Model 1894, Factory number 2224A / 2279, alloy, hole end, 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 a pretty good job of representing the item.