Marathon Mainspring No. 533 for Bulova 6AU, Benrus AG, Unitas 190, 195 - Steel

RN mainspring No. 533 for Bulova 6AU, Benrus AG and Unitas 190 - 195 caliber movements, 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.