Samson Mainspring No. 10110 for Landeron caliber 17 & 20 Sports Timer - Alloy

Samson Mainspring No. 10110 for Landeron 18½ ligne Sports Timer, caliber 17 & 20, white alloy, new in envelope. See image for precise mainspring specifications. I likely have several of these so the one you get may differ slightly 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 a pretty good job of representing the item.