That pistol appears to be correct for a Navy of that period. The serial number on the right front of the frame ahead of the trigger guard is correct; it was later moved to the rear, behind the slide stop pin.
The "dimple" magazine catch lock is correct, also; it was changed at #3190 to an altered one and then at about 6500 to the present type. I strongly suggest not removing the magazine catch. It is very difficult to do without scoring the frame.
Incidentally, that gun was made in 1912, before WWI.