Cas-Ker Mainspring JA705 for 18s Waltham Factory No. 2205 - Alloy

Cas-Ker Mainspring MS-JA705 for 18s Waltham, Factory No. 2205, probably made by Bestfit, new in sealed package. See images for further details. 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.