BESTFIT Mainspring 710K for ETA 810, Langendorf 1004-1022 & Venus 180-196 - Alloy

BESTFIT Mainspring 710K for Cupillard caliber 256, ETA caliber 810, Brac caliber 101, 102, Langendorf caliber 1004 - 1022 as well as Venus caliber 180 - 196 plus perhaps similar ébauche watches, 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.