BESTFIT Mainspring 311E for Buren 875, Gruen 235, 430, 431, 435, 440 - Alloy

BESTFIT Mainspring 311E for Buren caliber 875, Gruen caliber 235, 430, 431, 435, 440 movements plus perhaps similar ébauche watches, white alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slight 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 an adequate job of representing the item.