Sandsteel Sandalloy Mainspring S2201 for AS 748, 772, Font 355, A. Michel 630, 631, 632, Universal 220 - Alloy

Sandsteel Sandalloy Mainspring S2201 for AS 748, 772, Cyma 50, Font 355, Frey G, J, A. Michel 630, 631, 632, Universal 220 caliber movements, plus perhaps similar ébauche watches, alloy, 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.