I used to carry my 1957 Beretta 950b hammer down on a loaded chamber. As I recall, Beretta recommends hammer down, NOT in the half-cock notch. Cock and locked is asking for an ND, it isn't a 1911. Plus, you can't "lock" a 950 or 950b.
As was said, prior to 1968, Beretta 950 and 950b had no...