Pioneer Flight covers. 1937 (July 19-20), registered air mail cover to Tanger via Casablanca, franked by PEXIP souvenir sheet with four other stamps and International Philatelic Exhibition label, arrival markings on the back, VF and scarce, Est. $400-$500 (Image)

Pioneer Flight covers. 1937, pre-printed air mail cover from Paris to Tonkin (Hanoi), franked by two Port du Gard 20fr of type III (Yvert types IIa and IIB), a single of Plane over Paris 50fr emerald and the Banknote 50fr in pair with two definitive stamps, postmarked on arrival, fold did not affect stamps, still F/VF and scarce franking, Est. $400-$500 (Image)

Pioneer Flight covers. 1938 (July 25), Imperial Airways registered cover from Caudry to Australia, franked by 7 stamps, including Port du Gard 20fr in pair of type III (Yvert types IIB-IIA in se- tenant) and the Banknote 50fr x2, arrived to Southampton on July 28, then to Sydney (August 6) and to Melbourne on August 7, some wearing still F/VF, mounted on page from a Collection, last time sold on Spink London on January 11, 2019 for £480 plus appropriate fees, Est. $400-$500 (Image)

Pioneer Flight covers. 1938, registered air mail cover from Paris to Argentina, franked by Monoplane over Paris with red network 50fr together with nine other adhesives, Buenos Aires arrival marking is alongside, slightly reduced at bottom, still F/VF, Est. $250-$300 (Image)

Pioneer Flight covers. 1938 (November 26), Air France pre-printed cover from Paris to Argentina, franked by seven values, including 50fr blue with red network, Buenos-Aires arrival marking is on reverse, minor wearing, still F/VF, the last one sold at Spink for £260++ on January 22, 2019, Est. $250-$300 (Image)

Semi - Postal issues. 1930, ''The Smile of Reims'', sunken die proof of 1.50fr+3.50fr in blue, printed on wove thick paper, size 87x78mm, no gum as produced, some traces of hinges on reverse, still VF, Yvert #256, €700, Est. $150-$200 (Image)

Senegal. 1912, Navigation and Commerce, Millesimes (horizontal gutter pairs with No.3 on gutter), black or red surcharges ''05'' on 20c, ''05'' on 30c, ''10'' on 40c, ''10'' on 50c, ''10'' on 75c, complete set of five pairs, full OG, NH (both high values) or VLH, Dallay #49-53, €660 (Image)

Somali Coast. 1902, Mosque, Camels, Warriors, 4c-5fr, set of 12 (less 15c) with inverted centers (1c and 2c are not know as such), full OG, some low values NH, mainly LH, F/VF and scarce group, Yvert #39a/52a, €1,265 as hinged (Image)

Zeppelin Flight. 1933 (May 6-9), 1st SAF registered cover from Tanger to Brazil, franked by nine stamps (three - on reverse), including four air post values, cancelled by Tanger ''28.4.33'' ds, Friedrichshafen ''6.5.33'' connection and blue confirmation cachet, Pernambuco ''9.V.33'' arrival marking on the back, mostly VF and very scarce, Sieger #202, Est. $700-$800 (Image)

1940, Camel Post, black surcharge 5m on 10m black and carmine rose, 60 stamps in blocks of 4, 8, 18 and 30, representing ''Malmime'' (left pane R5/1) and two dots omitted (right pane R8/6), plus numerous other not listed varieties of surcharge, full OG, NH, VF, SG #78, a, b, var, C.v. £256 for listed varieties and single common stamps, Est. $150-$200 (Image)

Zeppelin Flight. 1933 (October 14-17), Chicago (Century of Progress) Direct Flight registered postcard from Tunis to Brazil, franked by four stamps, including 10fr black, Friedrichshafen ''14.10.33'' connection, red Flight marking and Pernambuco ''17.X.33'' arrival ds on reverse, VF and rare, Sieger #238, Est. $750-$800 (Image)