The cover featured Falkland Islands Dependencies stamps overprinted for the expedition, depicting historic polar exploration ships:
1d: Trepassey (1945–47)
2½d: Penola (1934–37)
3d: Discovery II (1929–31)
6d: Discovery (1925–27)
The stamps were cancelled with two circular "International Geophysical Year Expedition" marks dated 3 JAN 1958. This is a significant date, as it was during the height of the expedition. It also marks the historic date New Zealand, led by Sir Edmund Hillary, reached the South Pole.
A large circular cachet at the bottom reads "Royal Society Base ★ Halley Bay ★", indicating the mail originated from the research station established for the International Geophysical Year.
It was hand-addressed to the Royal Society at Burlington House, Piccadilly, London—the prestigious scientific institution that sponsored the Halley Bay base.















