Air Post stamps. 1930, Airplane over Mountains and Vaduz Castle, 15rp-1fr, complete set of six, in addition black surcharge 60(rp) on 1fr lake, nice quality, four of seven stamps with sheet margins, full OG, NH, VF, E. Diena certificate for the set, C.v. $648, SBK #F1-6, F16, C.v. CHF970 (Image)

Air Post stamps. 1930, Airplane over Mountains and Vaduz Castle, 15rp-1fr, complete set of six, unfolded blocks of six (3x2), post office fresh quality, full OG, NH, VF, C.v. $3,108++, SBK #F1-6, C.v. CHF4,500 as singles, Est. $900-$1,200 (Image)

Air Post stamps. 1931, Zeppelin over Naafkopf Mountains, 1fr olive black and 2fr indigo, complete set of two, perfect centering and fresh colors, full OG, NH, VF, C.v. $565, SBK #F7-8, C.v. CHF800, Est. $160-$200 (Image)

Air Post stamps. 1931, Zeppelin over Naafkopf, 1fr olive black, 2fr blue black, complete set of two, unfolded sheet margin blocks of four, perfect quality, full OG, NH, VF, C.v. $2,260++, SBK #F7-7, CHF3,200 as singles, Est. $750-$900 (Image)

Air Post stamps. 1936, Eagles, 10rp-50rp, complete set of five, full original grilled gum, NH, VF, C.v. $250, SBK #F9z-13z, C.v. CHF340 (Image)

Air Post stamps. 1936, Eagles, 10rp-50rp, complete set of five, grilled gum, thee-side sheet margin blocks of 15 (3x5, left parts of sheets), full OG, NH (LH on margin), VF, C.v. $3,750++, LBK #F9z-13z, C.v. CHF5,100++, Est. $1,000-$1,500 (Image)

Air Post stamps. 1936, Airships ''Hindenburg'' and ''Graf Zeppelin'', 1fr rose carmine and 2fr violet, complete set of two in sheets of 25, folded once along vertical perforation between second and third rows, full OG, NH, VF, C.v. $4,000++, SBK#F14-15, C.v. CHF7,500 as singles, Est. $1,500-$2,000 (Image)

Air Post stamps. 1939, Birds, 10(rp)-2fr, complete set of seven, unfolded sheets of 50, some plate varieties mentioned, nice condition with just occasional flaws possible, full OG, NH, VF, C.v. $2,000++, SBK #F17z-23z, C.v. CHF3,500 as singles, Est. $700-$900 (Image)