Swartchild Black Shield SUPER Mainspring ETA 1080, AS 1294, Gruen 705, Font 28 - Alloy

Swartchild Black Shield SUPER Mainspring for ETA 1080, AS 1294, Gruen 705, Font 28 caliber movements and likely others as well, alloy, new in envelope. See images for all calibers supported and 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 satisfactory job of representing the item.