Tru-Power Mainspring U569 for Rolex 374, Tudor 375, Elgin 748 - Alloy

Tru-Power Mainspring U569 for Rolex caliber 374, Tudor caliber 375, Elgin caliber 748 and a host of others as well, alloy, new in envelope. See image for precise mainspring specifications and further details. 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.