BESTFIT Mainspring JA553 for 0s Rockford No. 1077 - Alloy

BESTFIT Mainspring JA-553 for Rockford 0s Movements, Factory No. 1077, T end, alloy, new in 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.