<<Chip 2 does have the digit 5 as the left most character but I do not know off hand what the character on the right is>>

In chip #2 on the bottom, isn't it the right most character that is the 5.

Also, I think the left most character as formality to the 5.

I think you're right that the 2nd and 3rd chips on top are from the same club. I don't think the first chip is from the same club (2 brown chips alone is reason enough that they are from different clubs).

I wonder who has the definitive collection of these chips?