2006-08-07 02:58:47 GMT
I suspect there are different RPM labels.
The RPM label originally created is most probably http://www.discogs.com/label/RPM+Records+(2) (also not the profile: Re-issue label from the UK.
The RPM label of the 50s releases is a sublabel of Modern: http://www.bsnpubs.com/modern/modernstory.html
Created RPM  for the 50s label. Everyone please correct your mediums.