Marco Mainspring #3193 for Bulova 7AH, 7AK, 7AN, 7AP, ETA 734, 735, 740, 756, 757 - Steel

Marco Mainspring No. 3193 for Bulova 7AH, 7AK, 7AN, 7AP, ETA 734, 735, 740, 756, 757, Benrus AC caliber movements plus perhaps other similar ébauche movements as well, 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.