Samson Mainspring No. 5076 for Buren caliber 410, 470, Eterna caliber 520 - Steel

Samson No. 5076 steel mainspring for Buren caliber 410, 470, Eterna caliber 520, Benrus caliber R plus AS caliber 558 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 a pretty good job of representing the item.