Mongolia, **. Interesting lot with duplication. E.g. Mi 764-67 Postal transports (100) in sheets, SECIMEN overprints on Mongolian - American Friendship 1992 s/s (three), imperf set Music Instruments 2008, Imperf 500 T Aids stamp 2008, and s/s 247 (50). Also a few bank notes, and Chinese s/s. (Image1)