Marco Marshalloy Mainspring 2762M for AS 984, 1002, 1007, 1009, 1027, 1158, 1187, 1194, 1238 - Alloy

Marco Marshalloy Mainspring 2762M for AS 984, 1002, 1007, 1009, 1027, 1158, 1187, 1194, 1238, Gruen 580, 581, 582, 587, Universal 260, 261, A. Michel 290 caliber movements plus perhaps others, 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 an adequate job of representing the item.