Marco Mainspring #514 for 16s Illinois 17j Factory No. 47327 - Steel

Marco Mainspring #514 for 16s Illinois 10th to 12th Model Bunn and Sangamo, Factory No. 47327, DB-end, steel, new in envelope. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. See images for precise mainspring specifications. Images do a pretty good job of representing the item.