Softcover cardboard folio (8-1/4″ x 11-1/4″)  contains a mint stamp sheetlet and also an envelope with pre-printed postage (no postmark) on the inside front cover, and two large postcards on the inside back cover.  This somewhat odd item mixes Pyongyang and Shanghai, and–without any further explanation–we might just observe with a dose of irony as well.  See also 20312333B.  Grade: 1