HR Mainspring SA552 for 12s Rockford Factory No. 932 - Alloy

HR Mainspring SA552 for Rockford 12s Movements, Factory No. 932, alloy, new in envelope. See image for precise mainspring specifications. Yes, someone has correctly observed that this mainspring it a nearly exact match for the 12 South Bend mainspring. 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.