Tru-Power Mainspring U473 for FEF 86, 170, ETA 865 - 874, Cyma 404, Pierce 100 - Alloy

Tru-Power Mainspring U473 for FEF 86, 170, Cyma 404, ETA 865 to 874, Pierce 100 caliber movements plus perhaps similar ébauche watches, 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.