Acquired this from a US, WW2 service member's daughter. I can't seem to trace these markings or get any detailed information. Any info is appreciated.
I don't know squat about them but that one does have "Browning Patent Depose" right there on the slide, below the FABRIQUE NATIONALE.I'm gonna have to disagree with you. While Browning started selling that pistol in America in 1954, Browning guns are clearly marked BROWNING FIREARMS.
That one, as you can see, is marked FABRIQUE NATIONALE.
While it is, essentially, the same pistol, it is not a Browning. It is an FN. And FN has been making that pistol since 1935. Also, while Browning apparently got their poop in one sock re: serial numbers in 1958, FN did not. They would still put any number you wanted on the gun.