Help with info on my grandpas gun?

[Doubs]

Originally Posted by Mac Cat

Could it be an early commercial pistol transferred to a police unit ?

It absolutely was a commercial pressed into service by the police. The vertical C/N on the receiver, the blank undated chamber and the locking bolt & side plate serial numbered on the underside all point to a commercial.

There's a good chance that the barrel was replaced. All commercials Lugers with an alphabet suffix letter made after WW1 were .30 caliber and the suffix letter was also stamped on the barrel. If the serial number on the frame has a suffix letter then it's almost certain that the barrel was replaced by one in 9mm. Page 515 of Gortz & Sturgess state that the crown/G under the serial number on the barrel is a police inspection stamp. The significance of the small eagle above the serial number on the barrel is unknown.