12/AP/1914 Trelew - Buenos Aires, official cover franked with 5c., arrival backstamp, VF quality, rare! (Image)

28/AU/1914 SAN JULIAN - Buenos Aires, registered official cover franked with 25c., arrival backstamp, VF quality, rare! (Image)

Registered cover sent from Rio Gallegos to B.Aires on 9/SE/1914 franked with 17c., and arrival backstamp of 30/SE, very fine quality, rare! (Image)

Official cover sent by the "Ministry of the Navy, Cape Virgenes dependency", carried in the ship "Piedrabuena", franked with 15c. and dispatched in USHUAIA to Buenos Aires in OC/1914. On back there are several arrival marks for 12/DE, VF quality, very rare! (Image)

7/MAR/1915 COMODORO RIVADAVIA - Buenos Aires, registered official cover franked with 22c. (one stamp with small defect), arrival backstamp, rare! (Image)

Official cover sent from BATTLESHIP "MORENO" to Buenos Aires franked with 5c., cancelled PUERTO MILITAR OC/1918, VF! (Image)

VERY RARE CANCEL: Registered cover sent from PUERTO CABO BLANCO (Santa Cruz) to Buenos Aires franked with 30c. with spectacular lilac cancels, VF quality! (Image)

Official cover of the Ministry of the Navy sent from Baradero to B.Aires on 31/AU/1942 by registered mail with spectacular postage of 25c. (25 x 1c. Sarmiento), VF and attractive, possibly the largest quantity of this stamp on a cover! (Image)