I can see a shadow strike on the left of the 8 9 and 2. I know nothing about Commem. coins so that is all I've got. james
I see no other signs of DDR or RPD other than the anomaly on the date. I enlarged the pics and came to the same conclusion. My opinion only, good luck.
Strike doubling. Just on the 8, look at how this left side is chopped off some, that's due to the strike...
I wish there were better photos on Variety Plus. They recognize three RPD's for the Columbian. So does PCGS . But none of them are like yours. Much different positions of the first impression. I am with the rest maybe some mechanical shenanigans on the strike or a little die abrasion doubling.