1948, Argentinia, 70 c. Panamerican cartography congress Buneos Aires (Globe and Map of Argentinia incl. Antarctic Territory) , 4 imperf. proofs in issued design on ungummed paper, colours dark green (as issued), purple, blue (these on yellowish paper) and brown (on white coated paper), in addition issued stamp in block of 4 signed by designer Renato Garrasi. (Tax Method: Margin System)