BESTFIT Mainspring No. 105U for Font 2124 thru 2144 caliber movements - Alloy

BESTFIT No. 105U mainspring for Font 2124 thru 2144 caliber movements, alloy, new in likely a dirty and/or tattered 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.