I have an Atlantis-Reno $1 chip with a "PK" mint mark on it.
(Pics below from ChipGuide)

What does "PK" stand for, and was it a standalone chip maker at one time? Or a part of "Game On" chip company (which is reborn Chipco)? Or something else?

Here's pics of an Atlantis "PK" mark, and also a combo PK/GameOn dual marks on a chip (which makes me think PK and GameOn are related somehow.

Inquiring minds want to know.