HR Quick Fit Mainspring K518 for Valjoux caliber 77 Chronograph - Alloy

HR Quick Fit Mainspring K518 for Valjoux caliber 77 Chronograph movements, white alloy, new in possibly torn envelope. 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.