The Gold Nugget chips HHL...I cant speak on any other mold
With these stamps were sent to Sacramento

Top stamp in 1968

The 25c chips in 1962.
Ordered 1500 red
Added 500 more within 1 month (2000 total)
They have a San Diego ID on the ChipGuide...but sent to Sacramento.

Rumor is that they packed up shop in Sacramento and moved to San Diego in 1971/72?
I have no info on that....maybe one of the Southern California boys can look into it?

***Image from the ChipGuide