1831 unpaid FL from Buenos Aires to London, framed "Oz dt 14 S/perf. Oz" exchange mark, per "Packet Calypso" and "F.P.O. Au 10, 1831" pmk on back, filing folds away from the markings (Image)

Est.US$250

1869 two unfranked covers and FL from Buenos Aires to Hannover, French Packet No.1 and two different exchange marks, one oval "FR.2F20c", the other "F.42" (applied by error and crossed out by blue crayon) and "F.48", each via Bordeaux, with various due markings, charged "19 1/2" (decimes) in blue crayon, "Per Aachen England" and Asendorf arrival pmks on back. Also included 1876 cover from Buenos Aires to St. Gallen, octagonal French Packet N No.1, triangular "T", charged "80" in blue crayon (Image)

Est.US$500

1874 (Jan) cover franked with 5c Rivadavia, used from Buenos Aires to Mecklenburg-Strelitz, Germany, "S.S. Buenos Aires" and handstamped "UNPAID", red Ship Letter London, Verviers-Coeln distribution and arrival pmks on back, charged "9 1/2" in blue crayon (Image)

Est.US$150

1876 (20 May) cover with single 5c Rivadavia, tied by Buenos Aires departure cds, addressed to Italy, charged "80" in blue hs, paying 1.40 Lire Postage due (Penalty rate) with 40c (2) and 60c numerals, French entry pmk on red and additional charge markings applied there, fine cover with Torino transits and arrival pmks (Image)

Est.US$150

1880 (25 Jan) FL from Buenos Aires to Bordeaux, franked with 16c rouletted Rivadavia, ship endorsement and red "Rep. Arg. Bordeaux" French entry pmk, fine (Image)

Est.US$150

1880 (18 Aug) cover from Buenos Aires to Vienna, franked with 2x8c rouletted, tied by cds, with red "Repub. Arg" entry pmk, Italian ("Ambu. Marseglia-Genova") and Wien (16.9.80) arrival pmks on back, fine cover, signed Buhler (Image)

Est.US$150

1881 (9 Sep) cover from Buenos Aires to Bordeaux, franked with 2c and 10c green, tied by departure pmks, with French packet alongside, "Per Congo", with "T" and "7" charged on arrival, minor cover faults at top away from the stamps, Bordeaux (5 Oct) arrival (Image)

Est.US$200

1910 Centenary of the Republic, bicolor trial color proofs on wove paper, complete set, fine-v.f. (Cat No. 160-75P) (Image)

Est.US$150