Yugoslavia 1924 King Alexander Color Proofs

I have 3 sets of what appear to be color proofs of the 10 King Alexander stamps from the 1924 series. The first set have blank value tableaux, the second set are 20p denominations and the third set are 1d denominations. In each set the colors follow the colors of the 1924 set. The are generally centered at average-fine and are MNH with a few gum disturbances. Unfortunately, the second set is stuck to itself and to a cardboard backing; I will be putting it in the "sweat box" and hope for the best.

Any information regarding these sets would be greatly appreciated.

Regards, Chris

You may want to change the date in your title to "1923".

Your 20 Para stamps are in this link and are identified as trial color prints:

https://worldstampsproject.org/king...-stamp-flaw/

I could find nothing on the others yet.