When discussing the PPK as a pocket pistol, we need to put this issue into its proper historical context. The PPK was introduced shortly after the Walther PP pistol as a more concealable handgun for German police officers. Its compact size and reliability made it popular with the emerging Nazi police and military establishments too. It was also used by secret agents. If I am not mistaken, Allen Dulles, who later became a CIA director, carried one during World War 2. Of course, the PPks greatest claim to fame came as the handgun carried by the fictional British secret agent James Bond.
Now, time and techology have produced smaller pocket pistols since the creation of the PPK over seventy years ago. In fact, small 9mm handguns have been produced that are comparable to the PPK in terms of both size and weight. But we may consider the old PPK as a grandfather of modern pocket pistols. I hope this brief overview explains why the PPK is still viewed as a pocket pistol.
Timthinker