C&E Marshall Mainspring #465 for Hamilton 11½L grade 676, 687 Automatic #67621 / 716784 - Alloy

C&E Marshall Mainspring #465 for 11½ ligne Automatic Movements Grade 676, 687, Factory No. 67621 / 716784, 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.