BESTFIT Mainspring 311H for ETA 734 thru 739, Eterna 710, Marvin 610 - Alloy

BESTFIT Mainspring 311H for ETA 734 thru 739, Eterna 710, Marvin 610 caliber movements 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.