C&E Marshall Mainspring #419 for Hamilton 11½L grade 673, 686 No. 67321 / 716783 - Alloy

C&E Marshall Mainspring #419 for 11½ ligne Movements Grade 673, 686, Factory No. 67321 / 716783, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a good job of representing the item.