IVORY COAST (1972) Kossou Dam and Hydroelectric Plant*. Trial color proofs in strip of 5 with multicolor. Scott No C53, Yvert No PA59. Beautiful!
AVAILABLE AT $90
NEW CALEDONIA (1956) Dumbea dam*. Trial color proofs in strip of 5 with multicolor. FIDES issue. Scott No 303, Yvert No 287.
AVAILABLE AT $70
NEW CALEDONIA (1956) Dumbea dam*. Trial color margin proof. Scott No 303, Yvert No 287.
AVAILABLE AT $30
CAMBODIA (1960) Chhouksar dam*. Trial color proofs in strip of 5. Water conservation. Scott No 83, Yvert No 93.
AVAILABLE AT $75