I can only try to help with the info...most don’t want to hear it.
I think it stinks that some people only collect certain towns or areas and they have been buying these chips for years thinking that they are from an area they want to collect. And the chips might not even be from the same state. I would want to know where the chips I collect are from.

This is how easy it would be to make up an ID...

Image from the ChipGuide

These chips are 100% NOT from the Mountain Bar in Martinez. I do have the card. I also have a card for the real Joker Club in Martinez.

Joker Club on one side and the M B is for Mary and Bill...
Of course I just made this up... the Mary and Bill ID is fake...

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SOME REAL INFO...

The MB/Joker Club chips were originally sent to Sacramento...but they weren’t accepted..so they were sold to Harry Wong of Suisun City. Were they were used...I will post at a later date. I was surprised when I found out... because I always thought only one owner of that club. I do extensive research on Suisun City...I live about a mile from where this club was located.