I think this is a customization that may have started with Commercial Script. The P is basically the same shape, with a bit of added flourish; the k and z are the same; the 'a' is similar, but looks a bit squeezed. The letters that don't fit are the 'l' and the 'r'. The looping ascender of the l is not what one would expect if the 'k' does not loop (usually they both loop). The 'r' seems to have been hand-drawn to try to make the letter more recognizable, since the script 'r' can be an unfamiliar shape to people today.

- Mike Yanega