BESTFIT Mainspring 311N for A.S. caliber 1538, 1539 - Alloy

BESTFIT Mainspring 311N for AS Calibers 1536 & 1539 and Aurore {AV} caliber 4201 (which was the basis for the Hamilton Grade 676) plus perhaps similar ébauche watches, white alloy. 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.