We now have a full picture of the six Ukmar brothers, I have positively identified Bruno checking four movies, 1964 to 1967, in which he’s regularly credited: Maciste, gladiatore di Sparta (pic 3), Le spie amano i fiori (pic 5), Come rubammo… (pics 1 & 2, also with Rodolfo Scarchilli) and Professionisti per un massacro (pic 4).
With Salvatore Borgese in The Spy Who Loved Flowers