4 MILITARY AIR MAIL COVERS: 1941-42, all sent from Field Post Office No.475 and addressed to England, franked by three stamps of King George VI 2p gray or by single 6p pale violet and carmine rose, first one censored at Gibraltar with censorship No.2, others in England No.62, 1154 and 3686, generally F/VF, Est. $150-$200 (Image)

1889-96, Queen Victoria, 5c-5p, complete set of 13 in Spanish currency, including both shades of 25c, full OG, NH (couple low values with expertly hinge removed), mostly VF, SG #22/33. 26a, £262 as hinged, Est. $250-$300 (Image)

1906-11, King Edward VII, ½p-8s, color changed complete set of nine, watermark Multiple Crown CA, full OG (stamp of 1s with minor gum foxing at left), NH, mostly VF, SG #66/74, £650 as hinged, Est. $500-$600 (Image)

1931-33, King George V and View of the Rock of Gibraltar, 1p-3p, complete set of four, perforation 14, top right corner sheet margin plate No. blocks of four, 3p with wavy lines lathework at top margin, full OG, NH, VF, C.v. $190, SG #110/13, £104 as hinged singles, Est. $100-$150 (Image)

Zeppelin Flight. 1933 (October 14-17), Chicago Zeppelin Flight registered cover on shoulder from Germany to Brazil, franked by two stamps, Berlin-Friedrichshafen connection (on reverse) and confirmation markings in red, Pernambuco ''17.X.33'' arrival ds, VF and scarce, Sieger #238, €850++, Est. $350-$400 (Image)