1914 (April 1-15), Monaco Aerial Rally, six specially printed Rally postcards bearing the special vignette in red, tied by the violet Rally ''April 1914'' date stamp and special markings for Brussels, Gotha, Madrid, Milan, Paris and Vienna, mostly VF, Est. $400-$500 (Image)

1964, PHILATEC Paris Philatelic Exhibition, 1fr dark blue, indigo and brown orange, special souvenir sheet, nice and fresh, full OG, NH, VF, Yvert #BS5, €950, Est. $200- $300 (Image)

1964, Europa issue, 25c and 50c, special souvenir sheet of two, perfect quality, full OG, NH, VF, Yvert #BS6, €1,850, Est. $400-$500 (Image)

1976, American Bicentennial, 1.70fr carmine and black, perforated special souvenir sheet, fresh condition, full OG, NH, VF, Yvert #BS9, €1,300, Est. $300-$400 (Image)

1976, American Bicentennial, 1.70fr carmine and black, imperforated epreuve de luxe sheet, printed on thickened paper without gum, NH, VF and rare, only a few de luxe sheets were produced, Yvert and Dallay did not mention price for this proof, Est. $250-$300 (Image)

Air Post stamps. 1955-57, Sea Birds, 100fr-1000fr, complete set of four with perforation 11 and 100fr, 200fr and 1000fr with perforation 13, all with full OG, NH, VF, C.v. $734, Est. $250-$300 (Image)