Elgin Factory Mainspring for 17/0s grade 634 automatic - Alloy

Elgin Factory Mainspring factory for 17/0s grade 634 automatic 17j & 21j Swiss made movements, alloy, repackaged by C&E Marshall as their #82, new in sealed envelope. Base ébauche is typically the AS 1361. See image for 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