Alloy Mainspring for Buren caliber 45 & Alpina caliber 824

Unmarked Maker Swiss Mainspring for Buren caliber 45 and Alpina caliber 824 movements plus perhaps other similar ébauche watches, alloy, new in tiny 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.