BESTFIT Mainspring 711K for AS 1158, 1187, Bulova 10BC, 10BS - Alloy

BESTFIT Mainspring 711K for AS 1158, 1187, ETA 1280, Bulova 10BC, 10BS & 10BT, and Wittnauer 10E, 10S plus perhaps similar ébauche watches (including Caravelle movements), white alloy, new in possibly frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may vary 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.