Comsco Mainspring #1081 for Elgin 5/0s No. 2705 - Steel

Comsco Mainspring #1081 for 5/0s Elgin, Factory No. 2705, steel, new in envelope. Note while the mainspring is new the envelope has been handled quite a bit over the years. See image for precise characteristics. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.