Cas-Ker Mainspring 4575V for Landeron Chronograph caliber 48, 50, 148, 151 - Alloy

Cas-Ker Mainspring No 4575V for Landeron Chronograph calibers 47, 48, 49, 50, 51, 148, 149, 151 plus perhaps other chronographs as well, likely made by Bestfit, alloy, new in open package. 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 in 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.