Colombia - 1861 "Nueva Granada" 1p, master negative on celluloid film, designated “a”, particularly fine impression showing production notes at top and at base a tiny white paper affixed with a note “pas terib.” (not terrible); a spectacular item that takes us inside the Sperati workshop, one of two recorded for this issue. (Image)

Colombia - 1861 "Nueva Granada" 1p, master negative on film, showing black painted areas within and in the surround of the stamp design, such retouches made with the purpose of avoiding the light to diffuse laterally in the process of photographic reproduction. One of two matrices known for this Colombian issue, with no clichés or trial exposures present in the B.P.A. collection, the postal Museum in Paris, or the "Ultimate" collection. (Image)

Colombia - 1861 "Nueva Granada" 1p, glass support cliché, trial exposure in negative. Unique. (Image)

Colombia - 1861 "Nueva Granada" 1p, two trial exposures on photographic paper, with reversed image, designated a & b. The only such items in existence. (Image)

1859, 5c indigo, stone B, horizontal tête-bêche strip of three from the base of the sheet, positions 49-50-51, large to huge margins on three sides, slightly touched at right, very fresh with large part original gum; small scissors cut between stamps at left and small thin spot. An extremely rare error contained in this multiple, with a strip being scarcer than the four blocks of four recorded. Note: The inverted positions only occurred in the stone B of this denomination in positions 9, 11, 13, 41, 43 and 50 in the plate composed of 55 units. Provenance: Goeggel (Image)

1859, 10c orange-brown, a well margined pair of remarkable freshness in deep shade, showing at left an slightly over-inked denomination which resembles a "20" instead of a "10", cancelled by "Guaduas" in manuscript, small thin spot at right which does not affect the example with this visually impressive and very rare variety; ex Goeggel. (Image)

1859, 5c blue, stone A, a phenomenal example from the left of the sheet, excellent margins which go beyond the dividing lines between clichés on three sides, delicate and appealing shade displaying a quite uniform impression, tied to piece by neat strike of "Bogotá" oval handstamp in blue; an admirable quality example in every respect, probably the finest single usage known of this stamp; ex Hubbard and Frohlich. (Image)

1859, First Issue selection of 17 well margined stamps, nearly all unused, including also multiples with 20c pair (signed Rendon) and marginal strip of three (pos. 3-4-5), as well as 1p block of four; six examples with faults as usually found. (Image)

1934, "Olympiad of Barranquilla" 10p black and grey, an outstanding mint example with very good centring and freshness, original gum; very fine. (Image)

1886-1959, balance group of 23 stamps including "Condor" 10p used, 1959 Centenary of the First Postage Stamp set in eight imperforate pairs, airmails with Scadta 1920-21 30c rose in n.h. marginal block of four (vertical crease at right) with C. Valiente imprint in margin at top and 30c rose vertical pair tied to piece by "Hidroavion" postmark in violet; as well as 1886 5c pair on cover to Davos (Switzerland) redirected to Nuremberg. Very fine and unusual. (Image)