BESTFIT Mainspring JA434 for Illinois 6/0s Factory No. 47371 - Alloy

BESTFIT Mainspring JA-434 for 6/0s Illinois, Factory No. 47371, 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 an adequate job of representing the item.