N.B.MS Mainspring for Waltham 504 & Rayville 49 - Alloy

N.B.MS Mainspring for Rayville caliber 49 and Waltham (Swiss) grade 504 plus perhaps other 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.