Comsco Mainspring #1017 for Waltham 6s Factory No. 2217 - Steel

Comsco Mainspring #1017 for Waltham 6s movements, Factory No. 2217, steel, new in frail envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.