GJ.36, 4c. Moreno, with "MUESTRA overprint, VF (Image)

GJ.38, 5c. Rivadavia, groundwork of crossed lines, with "CERTIFICADO" cancel of San Nicolás (reconstructed), VF (Image)

GJ.41, 15c. San Martín, groundwork of horizontal lines, used, VF (Image)

GJ.44, 90c. Saavedra, with "MUESTRA" overprint, VF (Image)

GJ.47, 8c. on 5c. provisional, used, VF (Image)

GJ.49, 8c. Rivadavia, rouletted, with rectangular datestamp of Monte Caseros (Corrientes), VF quality (Image)

GJ.50, 16c. Belgrano, rouletted, with "MUESTRA" ovpt., unused, without gum, VF (Image)

GJ.56, 25c. Alvear, with "MUESTRA" ovpt., VF (Image)

GJ.83, 3c. Juárez Celman, with "MUESTRA" ovpt., block of 4, with small thin on back and some stain spots (Image)

GJ.85, 5c. Rivadavia, small collar, in block of 4, with defects, good appearance, low start (Image)

GJ.86, 6c. Sarmiento, used, VF quality (Image)

GJ.87, 10c. Avellaneda, with "MUESTRA" ovpt., hinged, thin on back (Image)

GJ.90, 25c. Belgrano, with "MUESTRA" ovpt., block of 4, VF (Image)

GJ.90, 25c. Belgrano, with "MUESTRA" ovpt., unused, without gum, thin on back (Image)

GJ.91, 30c. Dorrego, with "MUESTRA" ovpt., block of 4, with some stain spots (Image)

GJ.92, 40c. Moreno, with "MUESTRA" ovpt., VF (Image)

GJ.92, 40c. Moreno, pair with double perforation variety, one diagonal, used, VF quality (Image)

GJ.93, 50c. Mitre, used, VF (Image)

GJ.96, ¼c. José María Paz, die proof, first stage, on thin paper, transparent, in redish brown, VF quality (Image)

GJ.96/98 + 102 + 106 + 108/110 + 112/14 + 114A, ¼, ½, 1, 2, 5, 6, 8, 10, 40, 50 and 60c. (black-blue and black-gray), Sudamerica issue, with "MUESTRA" ovpt., in blocks of 4, VF (Image)

GJ.106, 5c. Rivadavia, with offset impression on back, used, VF (Image)

GJ.111a, 12c. Alberdi, on bluish paper, used block of 4, VF (Image)

GJ.112, 40c. Moreno, block of 25 stamps, datestamped "ENCARGADO 1er DISTRITO TELEGRAFICO POSTAL - MESA DE ENTRADAS", VF (Image)

GJ.114, 60c. Posadas, used block of 4, VF quality (Image)

GJ.119A, 50P. Gregorio Funes (unissued), very well perforated, VF quality (Image)