BESTFIT Mainspring 611K for ETA 900, 1080, Bulova 10BA, 10BE, 10ZE - Alloy

BESTFIT Mainspring 611K for ETA 900, 1080, Bulova 10BA, 10BE, 10ZE, AS 1287, 1294, Lavina 150.SC, Durowe 410, 412 & Benrus BF, DH caliber movements as well as a bunch of others and perhaps similar ébauche movements, white alloy, new in possible soiled envelope. See images for precise mainspring specifications, I likely have several of these and the envelopes may look slightly different but they are all the same mainspring. I specialize is 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.