N.B.MS Mainspring for Font 120, Wyler WC40, WC41 - Alloy

N.B.MS Mainspring for Wyler caliber WC40, WC41 and Font 120 which is the base caliber for the afortmentioned Wyler caliber, hence this also fits any other Font 120 based movements plus perhaps even more similar ébauche watches, alloy, new in envelope. See images for precise mainspring specifications. 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.