The rollmark on the left barrel appears normal for a prewar gun, but the one on the right side is odd; the factory left it blank on prewar parts and put ".45 Model of 1950" postwar. Perhaps someone added ".45 ACP" to a prewar part.
There was a factory in Brazil that made replacement barrels for the 1917s that were made for their govt. I can't remember the name of the company, must be old timers........
I think it is the barrel for the fairly recent Model 22 replica called the "Classic Model of 1917." Notice the front sight location. It is almost even with the muzzle and the front sight is pinned. Also there is no relief in the barrel threads for the pin.