1952: Airmail, Large Format sunken Die Proofs (3) by the American Banknote Co., with 5 c. blue, 10 c. green and 35 c. purple in issued colours without the 1953 15 c. value, all engraved on cards (226 x 151 mm.) with file numbers 72581, 72582 and 94848 respectively at top and ABN imprint below. Fresh and very fine, an attractive group. (Image 1) (Image)

1805c.: Cover to Leon, Nicaragua struck with scarce oval framed VILLANEUVA despatch handstamp in black (Harris fig. 122) with manuscript '4' (reales) rate adjacent. (Image 1) (Image)

1832 (Aug 24): Entire letter from Esparza to Cartago with manuscript "Esparza" cancellation framed in brown ink, in imitation of Harris fig. 31, presumably due to a mislaid handstamp. A rare and most unusual entire. (Image 1) (Image)

1849 (May 13): Entire letter from Punta Arenas to Lima, Peru carried outside the Mails and posted at the British Post Office in Panama, prepaid at '1/-' in red manuscript, struck with Crown "PAID AT PANAMA" handstamp in red. Reverse with PANAMA double arc cds (June 28) in black. Rare Scott = $ 2'200. (Image 1) (Image 2) (Image)

1861 (May 31): Entire letter from San Josê to Paris endorsed 'voie de Panama' and 'per Packet Anglais', struck on despatch with circular REPUBLICA DE COSTA RICA / SAN / JOSÉ handstamp in black (Harris fig. 117). Reverse with London transit (June 27) and struck there with framed "GB/1F 60c." accountancy marking in black. Charged '8' dêcimes due on arrival. A rare entire. (Image 1) (Image 2) (Image)

1863 (March): First Issue ½ r., the Large Format sunken Die Proof by the American Banknote Co., engraved in black in card (151 x 226 mm.) with pencil manuscript docket number at lower right '26223'. A superb Die Proof and of great rarity. (Image 1) (Image)

1863: ½ r. blue, a fine used example on 1874 entire letter addressed to the Italian Consul in San Josê, tied by oval framed "P. ARENAS" handstamp with 'Punta Arenas' cds alongside (June 25) in black. A fine and very scarce cover. Signed Calves.rn (Image 1) (Image)

1863: First Issue 2 r., lithographed Imperforate Colour Trials (5), printed in purple-brown, chrome yellow, rose carmine, pale vermilion and pale lilac, all on wove paper with large margins all round. A scarce and most attractive group. (Image 1) (Image)

1863: 4 r. green, American Banknote Co. imperforate Plate Proofs, with a fine block of four showing marginal imprint at top, and single (position 8) showing the "Double Transfer" variety (most noticeable in the stars above the ship vignette). Fresh, fine and scarce. (Image 1) (Image)

1863: American Banknote Co. Proofs (4) for the 1 peso value, imperforate on thick card paper, printed in black, red, green and in brown, fresh and very fine but for slightest of surface scrapes on the green example. Rare. (Image 1) (Image)

1881/82: '5 / Cts. / U.P.U.' in red on first issue ½ r. blue, an unused block of twenty (4 x 5) with last two stamps showing "American Bank Note Co. New York" imprint, fresh and fine, superb large part or unmounted og. Scott = $ 1'300. (Image 1) (Image 2) (Image)

1889: Soto 10 c., Waterlow working Die Proofs (2) imperforate in black on toned paper, first numbered 1048 showing diagonal crack across the Plate, second example numbered 1048A with repair and without crack, minor soiling commensurate with usage, a fine and rare pair. (Image 1) (Image)

1892 (May 1): Waterlow definitive issue, the complete set of ten imperforate Plate Proofs on thin wove paper, all in unissued colours. A most attractive and scarce set. (Image 1) (Image)

1901 (Jan): Monument 1 c. green & black, an unused horizontal strip of four, central stamps showing variety "Imperforate Between Vertically", of fine appearance, the large part og. with some trivial aging. Rare and much under-catalogued variety. (Image 1) (Image 2) (Image)

1901 (Jan): 5 c. grey-blue & black, a used block of four, variety "Imperforate Between Vertically", cancelled by target handstamps in black. Some toning but a very rare multiple Scott = $ 600. (Image 1) (Image 2) (Image)

1901 (Jan): Bicoloured pictorial issue, the complete set of ten values unused, fresh and very fine, unmounted og. Scarce thus Scott = $ 265+. (Image 1) (Image)

1907: Cañas 4 c. carmine & indigo, perf. 14 all round, an unused example of fine appearance, minor gum bends, large part og. A very rare stamp Gi 59 = £ 450/Scott = $ 500. (Image 1) (Image 2) (Image)

1907: Mora 2 col. claret & myrtle green, perf. 14 all round, an unused example of fine appearance, typical wrinkle on gum, large part og. A very rare stamp Gi 66 = £ 275/Scott = $ 300. (Image 1) (Image 2) (Image)

1910 (April 7): Juan Mora 2 c. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of deep green with file number 'C-902' and ABN imprint at base and pencil docket number 25359 at lower right. A fine and rare Proof Gi 78. (Image 1) (Image)

1910 (April 7): Jose M. Cañas 4 c. scarlet engraved Large Format Die Proof by the American Banknote Co., in close to the completed design inset on card (152 x 226 mm.) printed in close to, but somewhat deeper than issued colour but lacking some minor shading details in and around the eyes. The card with pinholes at edges but exceptional and rare Gi 79. (Image 1) (Image)

1910 (April 7): Mauro Fernández 5 c. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of orange with file number 'C-904' and ABN imprint at base and pencil docket number 25352 at lower right. A fine and rare Proof Gi 80. (Image 1) (Image)

1910 (April 7): Braulio Castillo 10 c. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of deep blue with file number 'C-905' and ABN imprint at base and pencil docket number 25355 at lower right. Slight vertical split to right of Proof area, otherwise a fine and rare Proof Gi 81. (Image 1) (Image)

1910 (April 7): Julian Volio 20 c. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of olive-green with file number 'C-906' and ABN imprint at base and pencil docket number 25354 at lower right. A fine and rare Proof Gi 82. (Image 1) (Image)

1910 (April 7): Eusebio Figueroa 25 c. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of deep violet with file number 'C-907' and ABN imprint at base and pencil docket number 25356 at lower right. A fine and rare Proof Gi 83. (Image 1) (Image)

1910 (April 7): Jesús Jimênez 1 col. engraved Large Format Die Proof by the American Banknote Co., the completed design inset on card (152 x 226 mm.) printed in issued colour of dark brown with file number 'C-908' and ABN imprint at base and pencil docket number 25357 at lower right. A fine and rare Proof Gi 84. (Image 1) (Image)