BESTFIT Mainspring 357T for Excelsior Park caliber 4, 40, 42 Chronograph - Alloy

BESTFIT Mainspring 357T for Excelsior Park caliber 4, 40, 42 chronograph movements and perhaps other similar movements as well, white alloy. See image for precise mainspring specifications and further helpful information. 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.