NEWALL Mainspring #1733N for AS 1186, EB 8340, MST 313, 349 - Alloy

NEWALL N-DUR-ALL alloy mainspring #1733N for AS 1186, Bettlach 8340, Meyer & Studeli (Roamer) 313, 349 caliber movements, 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 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.