Samson Mainspring No. 4037 for AS 1138, Enicar 210, 680, Frey 30, Kurth 220 - Steel

Samson No. 4037 steel mainspring for AS 1138, Enicar 210, 680, Frey 30, Kurth 220, Record 75, 102, 103, Benrus AZ, Wittnauer 7K caliber movements and perhaps others as well, new in envelope. 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 an adequate job of representing the item.