Nivaflex Mainspring for 12s Elgin No. 1720 - Alloy

Nivaflex Mainspring for Elgin 12s, Factory No. 1720, white alloy, new in envelope. See images for further details. I may have several of these so the one you get may differ slightly from the images. I'll note that I never did buy the whole "self-lubricating" that these claimed, they still need to be properly lubricated upon installation. 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.