Newall Security Mainspring #451 for Elgin 6/0s No. 2890 - Steel

Newall Security Mainspring No. 451 for Elgin 6/0s, No. 2890, steel, new in well handled envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item