Air Post stamps. 1930, Airplane over Mountains and Vaduz Castle, 15rp-1fr, complete set of six, in addition black surcharge 60rp on 1fr lake, fresh quality, full OG, NH, VF, C.v. $648, SBK #F1-6, F16, C.v. CHF970, Est. $200-$240 (Image)

Air Post stamps. 1930, Airplane over Mountains and Vaduz Castle, 15rp-1fr, complete set of six, unfolded blocks of four, post office fresh quality, full OG, NH, VF, C.v. $2,072++, SBK #F1-6, C.v. CHF3,000 as singles, Est. $700-$800 (Image)

Air Post stamps. 1931, Zeppelin over Naafkopf Mountains, 1fr olive black and 2fr indigo, complete set of two, nice centering and fresh colors, full OG, NH, VF, C.v. $565, SBK #F7-8, C.v. CHF800, Est. $150-$200 (Image)