Hard to tell if it was a RPM or not. The top upper serif looks altered. While it appears as lower south RPM could be possible, I don't see a listing on coppercoins for something like this. Taking a farther view back there was quite a hit on the date mintmark area. So that may have ruined the chance if ID-ing this one.
Even though it says that is CONECA RPM-020, that picture is not RPM-020. The mintmark is too far from the 5 and the width of the secondary mintmark is smaller than the one on RPM-020. NGC's pic looks like RPM-010.