NEWALL Mainspring #136N for Gruen 313, 341, 342, 343, 820, 821 - Alloy

NEWALL N-DUR-ALL alloy mainspring #136N for Gruen 313, 341, 342, 343, 820, 821, Enicar 90 caliber movements plus perhaps many others, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.