NEWALL Mainspring #1615N for Bulova 6EB, MST 237, 270, Universal 258 - Alloy

Newall Mainspring #1615N for Cyma caliber 384, 385, 386, Concord caliber 218F,  Marc Favre caliber 565, Universal caliber 258 plus perhaps many more similar ébauche movements, GR Ref 3606, white alloy, new in envelope. See images for precise mainspring specifciations. I likely have several of these so the one you get may differ 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.