1832 (Dec 16). Entire letter from Mahón (Minorca Island) to Avila via Madrid. Most likely due to the fact that the letter was mixed on departure with other correspondences originating from America, the “Yndias” straight-line and the due “5R” hs in red were applied in Madrid, thus paying an improper postage for the followed route. An extraordinary usage which is further enhanced by the exceedingly scarce “Yndias” postmark of Madrid. (Image)

Spain - 1850 10r Queen Isabella II, glass support cliché in black on dark greyish blue with an accompanying paper slip indicating that the reproduction was worked on between January and March 1939. (Image)

Spain - 1850: 10r Queen Isabella II, glass support cliché in grey-brown and with image reversed, dated “1/34” and with numberings in Sperati’s hand; a very rare piece with fewer than fifteen examples recorded. (Image)

Spain - 1851 2r Queen Isabella II, glass support cliché in black with handwritten production notations, together with a cliché on celluloid in vermilion with reversed image, and an essay on paper with notations on back alongside one of Sperati’s characteristic fingerprint colour trials. A spectacular and eloquent trio of separate working clichés, all produced from the single matrix. (Image)

Spain - 1851 2r blue error of colour, a group of four exceptional items including a cliché on celluloid film mounted on clay and framed by rose felt (highly unusual), the cliché with part of the neck of the Queen cut out in order to improve contrast and traces of blue ink in the corners with fingerprints of Sperati; an exceptional piece which was highlighted by Sperati on this extremely rare production material. Additionally two clichés on protected glass, one produced in August 1939 with slightly blurred design at right, and a much improved version executed in February 1941 (clearly including three external frame lines on two sides), as well as a final signed reproduction used, type B of the two types produced by Sperati; a unique and most significant group with the genuine pair of the 2r error of colour being considered the most valuable item of Spanish philately, and one of the great aristocrats of worldwide philately. (Image)

Spain - 1852 2r Queen Isabella II, glass support cliché in deep brownish red with image reversed, with working notes at base “voile vio” referring to the violet filter used to obtain an optimum contrast in lithography, and dating “Aug 43”. (Image)

Spain - 1852 2r Queen Isabella II, cliché on celluloid with reversed image, a working copy with technical notations at base “Veri (94)”, “voile vio”, designating the Verichrome celluloid film from Kodak and the violet filter used to obtain the contrast. (Image)

Spain - 1852 2r Queen Isabella II, glass support cliché of a pair in black showing manuscript annotations on either side of the design. (Image)

Spain - 1852 2r Queen Isabella II, glass support cliché of a pair in black with reversed image, with a part missing at bottom impacting the imprint just slightly, showing part of Sperati’s production annotations at base and dating “2/41”. (Image)

Spain - 1852 2r Queen Isabella II, trial exposure of a pair in grey brown with reversed image, with some production notes in pencil on front and back. (Image)

Spain - 1852 2r Queen Isabella II, finished production in pair, type E of the five types that Sperati produced of this value, with gum and pencil signature on reverse. (Image)

Spain - 1852 2r Queen Isabella II, finished production type E (of the five types that Sperati produced), single with mute barred obliterator, signed in pencil at back. (Image)

Spain - 1852 2r Queen Isabella II, finished production in vertical pair type A (of Sperati’s five types) on letter piece, with the forged cancels mute barred obliterator and orange date mark of Alcira; signed in pencil on reverse. (Image)

Spain - 1852 6r Queen Isabella II, trial exposure on photographic paper in greyish brown with reversed image, type B of the five types produced by Sperati (this type was actually made from the 5r value with the numeral changed), with production notes at base. (Image)

Spain - 1853 2r Queen Isabella II, glass support cliché in deep red, with copious notations that relate to colour, exposure time, chemical composition, and temperature, as well as “East 4” denoting Eastman Kodak celluloid film, dated “3/44”; a unique experimental cliché full of character. (Image)

Spain - 1853 2r Queen Isabella II, trial exposure in black with image reversed on photographic paper. (Image)

Spain - 1853 6r Queen Isabella II, trial exposure in dark brown with image reversed on photographic paper, dated in pencil “4/40” with a few manuscript comments also present. (Image)

Spain - 1854 4cu Coat of Arms, glass support cliché in red with reversed image, with technical comments in manuscript at base, dated “7/4”, including "5,5% tide gel" indicating the properties of the gelatin. (Image)

Spain - 1861 19cu Queen Isabella II, glass support cliché in an opaque bluish grey with reversed image, featuring manuscript comments about the production at top and base. Some cracking to the glass, but an exceptionally rare example. (Image)

Spain - 1861 19cu Queen Isabella II, trial exposure in black with image reversed on photographic paper, with production comments below the design “-dv ++dos” to indicate less exposure on front and more on reverse. (Image)

Spain - 1861 19cu Queen Isabella II, a finished reproduction on letter piece with forged cancels numeral 1 and part of Madrid circular date mark, signed in pencil on reverse. (Image)

Spain - 1865 1r Queen Isabella II, glass support cliché in black and with reversed image, copious production notations on all sides around the design; a worn working cliché, quintessentially Sperati, rich of comments to study. (Image)

Spain - 1865 1r Queen Isabella II, two remarkable essays on oblong pieces of paper, one numbered 164 with the stamp in green and the other numbered 174 with two imprints in dark brown, with abundant technical notations and Sperati’s fingerprints are present on each strip; a unique and visually impressive pair of working essays. (Image)

Spain - 1874 10p Allegory of Justice, trial prints on oblong strip of paper, showing two imprints of the stamp in black, generously annotated about colour composition and film exposure, one stamp has been marked by red cross and supposedly rejected. (Image)

Spain - 1875 4p King Alfonso XII, trial exposure in dark brown with reversed image on photographic paper, with a succinct annotation about the shadow on the stamp. (Image)