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Joe D.I believe I know the exact postcard you are talking about -
and I had an opportunity to purchase it at a card show maybe a year ago.
If we are talking about the same card -
then it is not a RPPC.
The one I remember was an dark newspaper quality printing.
I didn't like the quality that much... but found the idea of such an early Joe Jackson card to be intriguing. In the end though, I did not pursue the card.