PROOFS: 1958 International Geophysical Year (F.J. de Caldas) Issue: Courvoisiers' original trial printings in a completed design, all imperforate and affixed to the official Archival album page [#87], dated 30/12/1950. Unique. (5 items)[The Courvoisier proposal was not proceeded with as the stamp was issued 8 years later, printed by the State Printing Works, Vienna] (Image)

Estimate AU$400-600
Min. Bid. AU$320