Marco Mainspring #3228 for Bulova 4AM, 6EA, ETA 746, Recta M, MV, 108, 109 - Steel

Marco Mainspring No. 3228 for Bulova 4AM, 6EA, ETA 746, Recta M, MV, 108, 109, Benrus BU caliber movements and perhaps others, steel, new in envelope. See images for precise mainspring specifications. 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.