Alloy Mainspring for AS caliber 1294, MST caliber 371

Unmarked Maker Swiss Mainspring for AS caliber 1294 and MST caliber 371 movements plus perhaps similar ébauche watches, white alloy, new in small 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.