1926 (November 26), Pioneer Africa Flight registered cover from Zurich to Egypt, franked by four stamps, black boxed confirmation marking, Alexandria ''3.Dec.26'' arrival ds is alongside, undelivered and returned to Switzerland on December 21, appropriate hs on reverse, mostly VF, Est. $250-$300 (Image)

1850, ''Orts-Post.'', 2½rp black and red with framed cross, neat cancellation, neat four-side margins, fresh, VF, two experts' signs on reverse, C.v. $1,500, SBK #13I, CHF2,300, Est. $300-$400 (Image)

VALUABLE MAINLY CLASSIC COLLECTION IN A STOCKBOOK: 1850-1960, over 1000 stamps, one complete pane of 25 and 18 souvenir sheets, classic material mostly in used condition, starting with early Arms types and followed by sitting and standing Helvetia, early small definitives, semi-postal ''Pro Juventute'' issues and air post sets, fresh quality overall, we cannot guarantee all early cancellations, however vast majority of them looks completely all right, full OG, NH/LH or used, F/VF, very high C.v., Est. $1,500-$2,000 (Image)

Official stamps. FOR THE WORLD HEALTH ORGANIZATION: 1948- 50, black overprint ''Organisation Mondiale de la Sante'' on definitive stamps of 1941-49, 5c-10fr, complete set of 20, high values with top margins, full OG, NH, VF, SBK #6 -25, CHF450, Est. $120-$150 (Image)

Zeppelin Flights. 1929 (August 15-September 4), Round the World large size cover flown on route Friedrichshafen - Friedrichshafen, franked by 17 Icarus stamps of 1fr lilac, red confirmation cachet, machine ''4.9.29'' ds on reverse, mostly VF and scarce, Sieger #30Ad, Est. $300-$400 (Image)

Zeppelin Flights. 1930-32, Geneva Flight stationery postcard 10c dark green (September 14), uprated by two air post values, tied by red confirmation date stamps, Luposta Flight of 1932 (July 29-31), franked by two values, green confirmation and Rönne ''31.7.32'' drop ds, both are VF, Sieger #87, 170A, Est. $120-$150 (Image)

Zeppelin Flights. 1932, 6th, 7th, 8th and 9th South America Flight, three postcards and one entire wrapper, each one franked on front and on reverse, bearing Friedrichshafen connection date stamps and appropriate confirmation markings, mostly VF, Sieger #177/95, €480, Est. $300-$400 (Image)