1912, Rhine-Main Air Mail, 30pf deep green on pale gray paper, bottom right corner sheet margin block of four, full OG, NH, VF, C.v. $390++, Mi #III, €520++, Est. $150-$200 (Image)

1912 (June 13), Rhine-Main Air Mail, specially printed orange postcard, franked by dark blue surcharge ''Helber Hund'' 1m on 10pf orange, uprated by Germania 5pf green, tied by Darmstadt ''13.6.12'' date stamp, message is on reverse, VF, Sieger #13, €300, Est. $150-$200 (Image)

1912 (July 25), Gotha, 10pf violet blue, signed by ''E. Schlegel'' (flight engineer), used together with Germany 5pf green on postcard from Erfurt to Zella-Mehlis and forwarded to Gotha, ''Respinto'' (Rejected) label in green, mostly VF, Michel #5, €1,100, Est. $400-$500 (Image)

AIR POST STAMPS GROUP: 1930-31, Eagle, se-tenants of vertical pair of 20pf with ''X'' label and block of six, containing three horizontal pairs of 15pf+10pf, Zeppelin set of three and two official reprints of Liegnitz semi- officials with ''Barz & Co.'' hs, all with full OG, NH (except Zeppelin 2m stamp), VF, Mi C.v. €1,030, Est. $150-$200 (Image)

PIONEER FLIGHTS - NICE UNIT: 1909-31, 24 postcards or covers, starting with two Exhibition cards of Frankfurt (1909) and Berlin (1912), reply card Koenigsberg-Berlin-Koenigsberg of 1922, a group of flown items from Berlin, Hamburg, Konstanz to various cities of Sweden, including Flying Boat Service and many others, minor conveyance flaws possible, generally clean and F/VF, Est. $500-$600 (Image)