HR Mainspring SA600 for South Bend 18s No. #19528 - Alloy

HR Mainspring SA600 for South Bend 18s, No. 19528, T-end, alloy, new in envelope. See image for further details and precise mainspring specifications. 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 marginally adequate job of representing the item