What can the experts tell me about this Luger?

[Alsky]

Your Belgian proofed part could have come into Finland in that time frame ( less that 100 pistols came in from Belgium at that time )

Three finish Lugers are in the pictures and with all the same type of black plastic grips. The undersides of the grips all have the same markings from the molds. The upper two Lugers are both 9mm Tikka barrels and are in different lengths. The lower pistol in the picture is 30 cal. and is the one that is shown in the link above. I realize that I did not do a good job with these pictures in the artificial light this evening.