When did they stamp P08 on the frame?

[kurusu]

Originally Posted by alanint

My guess would be to differentiate the pistol from the P38 to the uninitiated. The P38 was then coming online and may have caused some confusion at supply depots.

That is also my guess. Besides Mauser only started P38 production in 1941.

I never consider Krieghoff in my reasonings. I consider them more of a "buddy" handout contract from H. Goering than a real war production pistol.
Sorry for the Krieghoff P08 die hard fans.