1963/64 Antarctic Campaign: Cover with datestamp of the station "Decepción" of 25/JA/1964, with cinderella commemorating the 10th anniversary of the station "General San Martín", very nice!
$11 Aerogram uprated with $11, sent from the scientific Antarctic station "Alte. Brown" to Buenos Aires on 17/FE/1975, with postmark of "6° Crucero Turístico", very nice!
1967/68 Antarctic Campaign: 2 Covers with cachet of "Transporte A.R.A. Gral. San Martín", one with postmark of the station "Belgrano", the other one with handstamp of the campaign, handsome!
Antarctic Campaign 1967/68, 2 covers with cachet of "Icebreaker A.R.A. Gral. San Martín", one with postmark of Antarctic station Gral Belgrano, and the other one with handstamp of the campaign, very nice!
Cover sent to Buenos Aires, with datestamp for 27/OC/61 along "BASE CONJUNTA" in dotted frame, and backstamps of "Destac. Militar esperanza" + "Oceanographic Group" in blue, rare!