Here are the pictures of my first pre-war PP. It is a commercial issue (Crown over N). The finish is excellent, the barrel very good (unfortunately sometimes I am just not able to make a good picture of the inside of the barrel ).
I was surprised to see the last three digits of the serial number inside the slide, because the post-war PP's don't have that. And I was also completely unaware that the firing pin is square, I had only seen the round ones so far.

It is stamped R.F. on the trigger guard. Any idea of the meaning or is it just the initials of a previous owner

In any case it is a very nice pistol in excellent shape. I am happy

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SAFN-49;MAS36/51;MAS49/56;SKS;L2A1;No.4 MK1;No.5 MK1's;K11;K31
M1 Garand;M1 Carbines;K98's;904/M39;m96;SVT-40;K98k M1912;MG42
M-Nagants;STG 58;FAL L1A1;G3A3;VZ52/57;VZ58;M16;PA-63;TT-33;
FN HP's,1903,1910,1922's;SACM1935A;Webleys;Walther P38's,PP's,PPK's

... and the last picture

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SAFN-49;MAS36/51;MAS49/56;SKS;L2A1;No.4 MK1;No.5 MK1's;K11;K31
M1 Garand;M1 Carbines;K98's;904/M39;m96;SVT-40;K98k M1912;MG42
M-Nagants;STG 58;FAL L1A1;G3A3;VZ52/57;VZ58;M16;PA-63;TT-33;
FN HP's,1903,1910,1922's;SACM1935A;Webleys;Walther P38's,PP's,PPK's

Of all the weird things, I am most impressed with the condition of those grips. A very fine example of the gunmaker's art.

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Let courage rise with danger, and strength to strength oppose.
A 9mm might expand, but a .45 won't shrink.