Waltham Factory Mainspring for 7½ ligne 750 Model B No. 2250 - Steel

Waltham Mainspring for 7½ ligne 750 Model B movements, Factory No. 2250, steel, new in envelope. These were available in several strenghts and the ones I can supply are shown in the drop-down menu. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. See image for further details. Images do a pretty good job of representing the item.