This is a folio measuring 8-1/4″ x 11-1/4″, and our scans 20312139A/B/C show you all but the outside back cover.  The pre-printed stamped envelope and joint-issue stamp sheet are accesories to the two postcards, which show Pyongyang and Shanghai respectively.  The huge stamps you see on the cards are real and not pre-printed, though not postmarked.  The reverses just say “Postcard” in Korean.  Grade: 1