BESTFIT Mainspring 3513E for FEF caliber 360 - Alloy

BESTFIT Mainspring 3513E for Fleurier (FEF) caliber 360 movements plus perhaps similar ébauche watches (Pierce 861 linear automatic, Lavina 140), white alloy. See image for precise characteristics. I have several of these and the envelopes look slightly different but they are all the same mainspring, so the one you get may differ 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.