Marathon Mainspring for Waltham 6½ ligne Model 650 #2239 - Steel

Marathon steel mainspring No. 637 for Waltham 6½ ligne Model 650 movements, factory No. 2239, new in envelope. See images for precise mainspring specifications. 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.