Sandsteel Sandalloy Mainspring S3248 for Gruen 137, 139, 1396, 1397, Omega 252 - Alloy

Sandsteel Sandalloy Mainspring S3248 for Gruen 137, 139, 1396, 1397, MST 284, 300, 301, 318, Omega 252 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 a barely adequate job of representing the item.