1920, 8 essay of Airplane surcharges on imperforate Hradchany stamps, inverted brown 14k on 500h, upright 28k/200h in dark lilac, red (2 - one with offset of the design on gum side), green, brown and black, in addition black 28k/500h, all with full OG, NH (1) or LH, VF and scarce group, each one expertized by Gilbert, Pofis C.v. CZK7,500=US$360

100.00

1922, two stamps with black inverted surcharges 50 on 100h green and 100 on 200h violet, full OG, NH or LH (C8a), VF, expertized by Blaha, Gilbert and others, C.v. $300 as hinged, Pofis #L4-5Pp, CZK8,000

100.00

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