Elgin DuraPower Factory Mainspring for 5½ ligne grade 927, 928 - Alloy

Elgin Factory DuraPower Mainspring for 5½ ligne grade 927, 928 movements, alloy, new in sealed envelope. Grades 927, 928 are AS 1677 based movements and thus this mainspring may also work for a handful of other AS calibers. I likely have several of these so the actual one you receive may differ slightly from the images. 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