HR Mainspring SA758 for Waltham 6¾ Ligne Model 670 #2244 / 2261 - Alloy

HR mainspring SA758 for Waltham for 6¾ Ligne Model 670, Factory No. 2244 / 2261, alloy. See images for precise mainspring specification. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. See image for further details. Images do a pretty good job of representing the item.