Samson Mainspring No. 1050 for AS 501, 543, 628, 673, 678, 722, Helbros 15 - Steel

Samson No. 1050 steel mainspring for A.S. 501, 543, 628, 673, 678, 722, Helbros 15 caiber movements and others as well, 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 an adequate job of representing the item.