Marco Marshalloy Mainspring 2914M for Longines 10.85M, Gruen 370, Movado 400 - Alloy

Marco Marshalloy Mainspring 2914M for Longines caliber 10.85M, Gruen caliber 370, Movado caliber 400 movements, and 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.