1931, dark blue Airplane and Air Mail overprints, ½p-£1, complete set of 13, full OG, NH, mainly VF, most stamps with tiny Zumstein guarantee hs on reverse, SG #1/13, £250 as hinged, Est. $250-$300 (Image)

1935, Airplane over Bulolo Goldfields, £2 bright violet and L5 emerald green, excellent set in every respect, full OG, NH, VF, C.v. $1,100++, SG #204-05, £1,100 as hinged, Est. $1,000-$1,200 (Image)

1939, Airplane over Bulolo Goldfields, ½p-£1, complete set of 14, nicely centered, full OG, NH, VF, C.v. $1,200, SG #212-25, £1,100, Est. $800-$1,000 (Image)