US BALANCE. virtually all covers and postal stationery including (in no particular order), 1935 China Clipper cover California to Philippines, #191 used (straight-edge), couple of unused Spanish American war period private mailing cards, 1900s/70s government penalty envelopes and cards, assorted early Bureau issue covers including few registered, UX23 with "4th Reg USMC/ Shanghai China Jul 14 1931" duplex, 1899 cover with "Mil Sta No 1 Philippine Islands/ Manila" 1899 duplex, couple of POW cards from internees in Philippine camps addressed to USA, F1 on 1912 registered cover, some mint Columbian Expo postal cards plus two used cards with Expo machine cancel, UPSS S10PSb (1891 1c Grant) Production Specimen vertical pair with indicia "cancelled" by strike of three parallel violet lines (small faults, UPSS $6000 as singles), UX9 trial color proof, finally the balance of a Dr Max Kronstein airmail exhibiti showing early airplanes engaged by the US postal service to deliver mail and including some flight covers of the 1920s/30s, a censored UX27 used 1918 from Peking China as a reply card with Chines stamps over indicia, etc., usual mixed condition, very good to very fine