Swartchild Black Shield Mainspring for Elgin 18s #2446 / 2096 - Steel

Swartchild Black Shield Mainspring #4354 for Elgin 18s Class 1 Railroad movements, Factory No. 2446 / 2096 , Steel, new in envelope. See images for further details. This is not an easy mainspring to find and while the 812 may function similarly it's likely way too strong for a properly adjusted 21j and 23j movement, which is what this mainspring is for. I likely have several of these so the one you get 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.