Air Post stamps. 1930, Airplane over Mountains and Vaduz Castle, 15rp-1fr, complete set of six, nicely centered, full OG, NH, VF, C.v. $518, LBK #108-13, C.v. €640 (Image)

Air Post stamps. 1931, Zeppelin over Naafkopf Mountains, 1fr olive black and 2fr indigo, complete set of two, perfect centering and bold colors, full OG, NH, VF, C.v. $565, LBK #114-15, C.v. €700 (Image)

Air Post stamps. 1936, Eagles, 10rp-50rp, complete set of five, grilled gum, top sheet margin blocks of four, full OG, NH (LH on margin away from the stamps), VF, C.v. $1,000, LBK #143y-47y, C.v. €1,200++ (Image)

Air Post stamps. 1935, First Air Mail Flight ''Vaduz - Altenrhein - Innsbruck'', black surcharge 60rp on 1fr lake, block of four, nice centering and intact perforation, full OG, NH, VF, C.v. $520, LBK #148, C.v. €760++ (Image)

Air Post stamps. 1936, Airships ''Hindenburg'' and ''Graf Zeppelin'', 1fr rose carmine and 2fr violet, complete set of two, blocks of four, full OG, NH, VF, Dr. Enzo Diena certificate, C.v. $640, LBK #149-50, C.v. €1,040++ (Image)