1870-71 Third issue American Bank Note revenues group with three 25c finished proofs except for coat of arms. 10c to $20 mixed imperfs, File copy of $20...

1895 American Banknote Co. file card, dated at top Feb. 1895 bearing imperf 5c Llama in deep claret, engraved on India paper with marginal file number...

1895 American Banknote Co. file card, dated at top Oct. 1895 bearing imperf 10c Llama in orange, engraved on India paper with marginal file number 26078...

1910-20s Revenue collection of "SPECIMEN" overprints, with 1c to 50s top left corner marginals with red number in top margin and overprinted Specimen with...

1887-89 American Bank Note imperf. plate proofs on thick card paper in pairs with unissued 1c and 2c, issued 3c and 5c plus 10c volcano, very fine.

1892 Landing of Columbus with 5c grey-black imperf. proof mounted on card, 25c brown and 1p light green imperf in unissued colours unused without gum,...

1892 Landing of Columbus Hamilton Banknote co composite die proof in black, arranged two by four, the top six values complete, the bottom two with duty...

1893 Founding of the City of Isabella 2p green issued stamp, an imperf block of four unused on slightly yellowed paper, three single imperf colour proofs...

1894 composite Die Proof for the Liberty design by the Hamilton Banknote Co, 1c to 1p engraved in black on india paper, stuck to card with file number...

1896 Hamilton Bank Note Co. composite proof for 1c for Honduras, 2c for Nicaragua and 5c of Peace and Volcano of Salvador, all in an orange-red shade,...

1896 Hamilton Bank Note Co. master die proof of the Volcano and Peace design engraved in black on thick card, without duty plates at base, numbered '900';...

1902ca. Group of Bradbury Wilkinson photographic essays from their archive on two pieces, with 21 stamp-size photographs in sepia on glossy paper of essays...

1877 American Bank Note Co. hand-drawn essays in ink for the fiscal issue with 1p black and the 2p in purple-red, in different designs with Arms at centre,...

1892 Waterlow set of four in imperf. horizontal strips of three with 1c bronze-green, 2c vermilion, 5c brown and 10c violet on thick card, numbered S.T....

1892 Waterlow imperf master die proof for stamp image for a postal stationery card, in claret on thin card, without Duty plates at sides and at base, some...

1908 Revolt of the Immortal 33 group of 11 imperf. proofs of the 2c value in various unissued colours, mostly without gum, very fine.

1859 (Jan 1) fine impression 2r. red on bluish paper, unissued, an unused example of rich colour with large margins all round, fine and fresh, small part...

1861 1/2r. orange, coarse impression, an unused irregular block of fifty-three from the bottom of the sheet with margins on three sides, first setting...

1861-62 Arms 1/2c violet mint block of six with large margins all round, transfer type 12-7-8 / 18-13-14, fresh large part o.g., good colour, very fine.

1864 Album page study of the 1 Centavo black on pink set-out over 2 pages with 25 examples including an unused, four margined block of 8 (4 x 2) with Meri...

1864 Album page study of the 3 Centavo black on yellow with two complete sheets of 24 (4 x 6), one with four margins, both of fine fresh appearance, also...

1864 4 Centavo black on blue paper with two complete sheets of 24 (4 x 6), two contrasting shades, the darker with P Meri Cert (ä2002), a single from position...

1864 4 Centavo black on blue paper in complete sheet of 24 (4 x 6), that details the four types within a sheet, four margins, tiny nick in the margin at...