GJ.45, 1877 provisional 1c., beautiful pair used in Buenos Aires on 1/JUL/1877, with guarantee mark of Van der Wee on back, excellent quality! (Image)

GJ.45a, 1877 1 on 5c. with INVERTED OVERPRINT var., used, excellent quality, rare, signed by Victor Kneitschel on back! (Image)

GJ.57h, PROVISORIQ variety, VF quality! (Image)

GJ.59, large block of 12 with the overprint VERY SHIFTED, also the 2 stamps at bottom right with "IROVISORIO" variety, excellent! (Image)

GJ.91, 1888 30c. Dorrego, block of 4 with double MUESTRA overprint (one albino, without ink, only its relief can be observed from the back), MNH, excellent! (Image)

GJ.96, die proof of ¼c. value (José María Paz) in the FIRST STAGE (not adopted), printed in black on thin paper, excellent quality, rare! (Image)

GJ.97, 7 die proofs of ½c. value (Urquiza) in the third stage (adopted), 7 different colors and shades, printed on thin paper, excellent quality, rare group! (Image)

GJ.98, 7 die proofs of 1c. value (Velez Sarsfield), type I in the second stage (adopted), 7 different colors, printed on thin paper, excellent quality, rare lot! (Image)

GJ.103, 4 die proofs of 3c. value (Juarez Celman), 4 different colors, printed on thin paper, excellent quality, rare lot! (Image)

GJ.106, die proof in brownish-lilac of the 5c. value (Rivadavia), type II (small head), adopted second stage (with the thick curved line in the middle, and the left eye looking ahead), printed on thin paper, excellent quality, rare! (Image)

GJ.106, die proof in carmine-red of the 5c. value (Rivadavia), type II (small head), unadopted first stage (with the thin curved line in the middle, and the left eye looking up), printed on thin paper, excellent quality, rare! (Image)

GJ.108, die proof of the 6c. value (Sarmiento), printed in black on paper with glazed front, excellent quality, rare! (Image)

GJ.108, 3 die proofs of the 6c. value (Sarmiento) in different colors, printed on thin paper, excellent quality, rare lot! (Image)

GJ.109, 4 die proofs of the 8c. value (Rivadavia) in different colors, printed on thin paper, excellent quality, rare lot! (Image)

GJ.110, 6 die proofs of the 10c. value (Avellaneda) in different colors, printed on thin paper, excellent quality, rare lot! (Image)

GJ.111, 4 die proofs of the 12c. value (Alberdi) in different colors, printed on thin paper, excellent quality, rare lot! (Image)

6 Die essays of the unissued 20c. value (Avellaneda) in different colors, printed on thin paper, excellent quality, rare lot! (Image)

Die essay of the unissued 24c. value (Vicente Lopez), printed in black on paper with glazed front, excellent quality, rare! (Image)

Die essay of the unissued 30c. value (Dorrego), printed in black on paper with glazed front, excellent quality, rare! (Image)

Die essay of the unissued 15c. value (old San Martin), printed on paper with glazed front, excellent quality, rare! (Image)

GJ.112, 2 die proofs of the 40c. value (Mariano Moreno) in different colors, printed on medium paper and paper with glazed front (the one in sea-green killed), excellent quality, rare lot! (Image)

GJ.113, 1889 50c. Mitre, block of 8 with sheet margin and complete printer imprint, MNH (+50%), superb! (Image)

GJ.115, die proof of the 1. value (San Martin), printed in black on paper with glazed front, VF quality, rare! (Image)

GJ.115, die proof of the 1. value (San Martin), printed in sea-green on paper with glazed front, VF quality, rare! (Image)

GJ.115, 2 die proofs of the 1P. value (San Martin) in different colors, printed on thin paper, excellent quality, rare lot! (Image)