Alloy Mainspring for AS caliber 953

Unmarked Maker Swiss Mainspring for AS caliber 953 movements plus perhaps similar ébauche watches (there are several), 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.