While mine do not have expiration dates (the backs are completely blank) yours appear to be in excellent shape. Mine seem to have been stored in a wallet. All dog-eared and folded.

I believe the signatures on mine are different than your yellow one (one is the same as your bottom blue one). Do you have traders? Are you interested in trading? Please LMK

Aside from that, it appears that these are printed out (onto card stock), several to a sheet and then cut into rectangular tickets that appear to not be of uniform sizes.

TCR lists all of the "Prize Unit" chips as 1968, with two exceptions (1970 and 1972). Sure would be nice to know what came first, the chicken or the egg?

Paper vs chips and with respect to the paper, expiration/issue dates vs no dating.

Thanks for the link!

Jim