N.B.MS Mainspring for Montilier caliber 64 Pocket Watch - Alloy

N.B.MS Mainspring for Montilier caliber 64 movements, plus perhaps similar ébauche watches, white alloy. The caliber 64 is a 17 ligne pocket watch. 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.