I would guess that this comes to me from the South African research station on Marion Island. I can't find a reference to the SA Agulhas II missions but I did find an article saying the vessel returned to port this month after a journey to the island. Same month as the (Cape Town) postmark.
Three stamps from a set of 12 that feature artwork from the official host city posters for the 2014 FIFA World Cup. From left to right, posters for Belo Horizonte, BrasĂlia and Cuiabá.