Tru-Power Mainspring BU15 for Felsa 700, 705, MST 410, 411, Bulova 9AB, 9ABC, 10AUC automatic - Alloy

Tru-Power Mainspring with attached bridle BU15 for Felsa 700, 705, MST 410, 411, Bulova 9AB, 9ABC, 10AUC caliber automatic movements and perhaps others as well, 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 an adequate job of representing the item.