1931 (February 26), Imperial Airways First Flight pre- printed cover England - Africa, addressed to Nairobi, franked by two adhesives, postmarked on arrival, mostly VF, Est. $120-$150 (Image)

1935 (December 12), Pioneer Flight cover from London to Buenos Aires, franked by two horizontal pairs of 1s bister, each one with perfin HUTH, delivered by German aircraft from Stuttgart, machine arrival ''15.12.35'' ds, mostly VF, Est. $100-$150 (Image)

1883, Queen Victoria, 2s6p lilac, printed on bluish paper, watermark Anchor, nice quality single, full original gum with slight waves at top, LH, VF and scarce, C.v. $9,250, SG #175, £6,000, D. Brandon certificate, Est. $3,000-$4,000 (Image)

1912, King George V, 1½p red brown, Simple Royal Cypher watermark, right sheet margin block of four, upper right stamp with ''PENCF'' variety (position R15/12), full OG, NH, VF, SG #362, a, £430++, Est. $250-$300 (Image)

15th Congress of the UPU in Vienna (1964) 1953-64, blue hard cover booklet contains 114 mint stamps and two Shakespeare Commemorative Pictorial Air Letter forms, including first Castles set (£285), graphite and phosphor line sets, regional stamps (complete for the period) and postage due set of 13 from 1959-63, generally nice quality, minor toning spots did not affect the stamps, mostly VF, Est. $150-$200 (Image)