DATZ Mainspring #545 for Elgin 37s 8-Day Factory No. 4457 - Steel

DATZ Mainspring No. 545 for Elgin 37s Factory No. 4457, steel, new in envelope. This mainspring is made specifically for Elgin 8-day car and travel / desk clocks. 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.