NIGER (1974) Infant*. Die proof in grey signed by the engraver COMBET. World population year. Scott No 207, Yvert No 301.
AVAILABLE AT $80
CAMBODIA (1972) United Nations emblem*. Die proof in green signed by the engraver MIERMONT. Scott No 292. Yvert No 307. United Nations Conference on the Human Environment.
AVAILABLE AT $140
NIGER (1974) Infant*. Globe*. Die proof in dark blue signed by the engraver COMBET. World population year. Scott No 297, Yvert No 301.
AVAILABLE AT $100