HR Mainspring SA553 for 0s Rockford Factory No. 1077 - Alloy

HR Mainspring SA553 for Rockford 0s Movements, Factory No. 1077, alloy, new in envelope. See image for precise characteristics. 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 suitable job of representing the item.