Marco Mainspring #165 for Elgin 0s Factory No. 1713 - Steel

Marco Mainspring #165 for Elgin 0s, Factory No. 1713 , steel, new in envelope. See images for further details. May times Marco mainsprings were just repackage factory mainsprings and given how sticky this one is I'm betting it is. 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.