Marco Marshalloy Mainspring 2863M for Gruen 818, 819, Alpina 819, Rolex 357, 600 - Alloy

Marco Marshalloy Mainspring for Gruen 818, 819, Alpina 819, Rolex 357, 600 caliber movements plus perhaps other similar ébauche movements as well, white alloy, new in 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.