HR Mainspring SA737 - Waltham 6/0s Jewel Series 1912 No. 2235 - Alloy

HR Mainspring SA737 for Waltham 6/0s Jewel Series, Factory No. 2235, alloy, 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.