Left side: GARDONE V.I. 1931
Worn or misread stamp, I think.
That ought to be Gardone V.T. for Gardone, Val Trompia (Trompia Valley).
Of course, 1931 does not match up with the date of build as an M91/38. Regardless of the theory (see below) one might reasonably suspect that, with the wartime emergency switch back from 7,35 to 6,5 a certain amount of "mix'n match" took place to use up what was in stock in the factory.
Center: Beretta
Right: 14811 with a circle and FF or FB in the middle
Again, could be a worn stamp for PB = Pietro Beretta
And the number could be (letter not number) I 4811. It's all very tricky without having the rifle in one's hands!
The bolt tang top side is stamped: AD 8813
That is the format for an
Italian
army registry number a.k.a matrix number. This is the number that was stamped on the completed rifle when it was accepted. The number is usally to be found on the left side of the barrel and on the butt. The series started new for each type of rifle, want from A0000 to Z9999 (25 letters - no J) then AA....AB... etc. At least, that was the theory. In practice there appear to have been considerable deviations and inconsistencies.
bottom side: 2 (over) F1 or FI
an O or 0 is also stamped on underside of bolt on rail