1929, two trial Airplane surcharges 14k (brown) and 24k (blue) on imperforate Hradcany 1000h violet, large part of OG, VF and scarce, properly expertized

100.00

1920, seven trial Airplane surcharges 28k on imperforate Hradcany stamps of 20h greenish blue (black), 20h carmine (black), 25h (black), two of 200h (black and brown), two of 500h (blue and greenish black),large part of OG, VF and scarce group, each one properly expertized

250.00

1922, inverted black Airplane surcharges 50h on 100h and 100h on 200h, large part of OG, VF, both are properly expertized, C.v. $300

150.00

1927 (April 19-20), Pioneer Flight Prague - Braunschweig registered cover, franked by four stamps, including complete set of air post surcharges, all appropriate markings and arrival ds, mostly VF

75.00

1936 (May20-24), Air France cover prepared for 2nd SAF, addressed to Buenos Aires, franked by five air post stamps, tied by Smrzovka "19.V.36" ds with Prague transit, red German confirmation marking letter "e", apparently delivered by German Luftpost with Buenos Aires "24.5.936" machine arrival on reverse, mostly VF

100.00