Westin,
The acceptance stamps do not tell anything about what part of the military(army) received the pistol, other than it is definitely military. Guns were transferred(sold) to the police from the factory and or later by the Army.
The side plate is a much later replacement, and looks to me like a reproduction part- based on the uneven finish of the metal and the "cast" appearance.
Norm is correct about "value", but a G date makes it a "collectible shooter"
. JMHO
There is always a chance of finding an original #14 side plate made by Mauser and replacing the repro one- then you would have matching numbers- but not an original matching pistol- but it might look better, but not shoot any differently.