Marco Marshalloy Mainspring 3894M for Bulova 13AT, 13AO - Alloy

Marco Marshalloy Mainspring 3894M for Bulova 13AT, 13AO caliber movements plus perhaps others, white 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 a pretty good job of representing the item.