Interesting ...Interesting. That's the same stamp used by Walther to indicate "updated/improved parts" on post-war guns, like the P-1 and P-5. It's apparently a stamp they had used earlier? Or, could it be this PP was sent back to Walther for some work, post-war? Just speculating here; not giving a definitive answer...
Interesting ...
Colt had a 5 point star stamped on the trigger guard of of the Single Actions that were re-worked at their factory...You may be on to something .
My next step is to field strip it and see if I find anything else.
Best regards,
Mario