Samson Mainspring No. 10356 for Record 25, 26, Unitas 111 - Steel

Samson No. 10356 steel mainspring for Record 25, 26, Unitas 111 caliber movements and perhaps others as well, 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.