Samson Mainspring No. A56 for Universal 139, Kurth 384 Automatic - Steel

Samson No. A56 steel mainspring for Universal 12¼ ligne calibers 139, Kurth caliber 384 automatics and perhaps others, 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.