H. & W. Perrin Co. Mainspring for 16s Illinois 60hr Pocket Watches No. 47309 - Alloy

H. & W. Perrin Co. LTD Mainspring for 16s Illinois Bunn Special 60hr movements, Factory No. 47309, Alloy, new in envelope. See image for precise mainspring specifications. H. & W. Perrin is the largest supplier of horological materials in Canada. 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 suitable job of representing the item.