ETHIOPIA (1973) WMO emblem*. Set of 4 progressive proofs. Scott No 661, Yvert No 666. Centenary of Meteorological Cooperation.
AVAILABLE AT $100
ETHIOPIA (1973) Anemometer*. WMO emblem*. Set of 2 progressive proofs. Scott No 662, Yvert No 667. Centenary of Meteorological Cooperation.
AVAILABLE AT $100
MAURITANIA (1985) Drop of water*. Dead trees*. Set of 3 progressive proofs including final colors. Fight against drought. Scott No 588, Yvert No 563.
AVAILABLE AT $25