Cover sent on 15/NO/1961 from SWITZERLAND to Buenos Aires (arrival backstamp of 13/DE/1961) and from there forwarded to the Destacamento Naval Orcadas, with arrival mark of 8/DE/1962, very interesting, rare origin! (Image)

MAIL SENT FROM SOUTH POLE TO NORTH POLE: Cover sent from Orcadas Base to Observatory Dikson (Russia) on 15/DE/1961. It bears transit mark of Ushuaia (6/MAY/1963), and arrival datestamp for 16/NO/1964 (on back), returned to sender, VF quality, rare! (Image)

Cover sent from NORWAY to Destacamento Naval Orcadas on 4/JUN/1963, with transit mark of Ushuaia for 25/JUL (back) and arrival on 11/JA/1964, VF, rare origin! (Image)

MAIL SENT FROM SOUTH POLE TO NORTH POLE: Cover sent from Orcadas Base to Napiiri (Finland) on 21/JUN/1963, with transit marks of Ushuaia (25/FE/1964) and Rowaniemi (Finland) 5/MAR, and arrival on 21/MAR. It was returned to sender, via Helsinki (transit mark 30/MAR), VF, rare! (Image)