Mark,
Here is an interesting paradox. Your pistol's markings seem to be in "Beretta" conflict.
The Ser.# and lack of a Fascist era designation marking on the slide indicate that it is late war production, after the collapse of the Fascist government, and during the period of the RSI which was formed on Sept. 28, 1943.
The Air Force marking indicates that the pistol was consigned to the Royal air force.
This is strange because the Royal air force had already capitulated and was no longer fighting for the Axis, but, like the Royal Italian Army, it was probably fighting in the South of Italy against the Axis.
Thus the "Beretta" conflict.
Here's the explanation (Menchini P. 206):
Beretta mixed unsold pistols with pistols of subsequent contracts, and pistols in stock, some with markings, ie. Royal air force and army, were added to those of following contracts.
Also, it seems that Beretta registers did not state the date of manufacture, but the date of consignment--a ser. # would be recorded referencing the date of consignment, instead of the date of manufacture.
So, your pistol, like mine, while appearing to have conflicting markings, is correct, in a "Beretta" sort of way.
Mark, I will send you this email with additional info. and multiple page numbers, so that you can find it in Mencini's book. Like I said, the book is too narative, and could be much better organized, but, it's still a wealth of info.
Pancho