My guess would be 1950s or early 1960s. Here's some of the last before they closed their doors.
http://www.gunsinternational.com/Ber...n_id=100323077
http://www.gunsinternational.com/BER...n_id=100134241
You have S. Umberto and Sanatina Bernardelli too, but Old Vincenzo was a cut above.