BOREL Mainspring JA731 for Waltham 0s Factory No. 2228 - Alloy

BOREL Mainspring MS-JA731 for Waltham 0s movements, Factory No. 2228, alloy, new in unsealed packaging. 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 an adequate job of representing the item.