COMOROS (1956) Village well pump*. Trial color proofs in strip of 5. FIDES issue. Scott No 43, Yvert No 14.
AVAILABLE AT $50
MAURITANIA (1960) Pastoral well*. Trial color proof in reddish-violet. Scott No 120, Yvert No 140. Not easy to find!
AVAILABLE AT $20
NIGER (1966) Water cycle*. Globe*. Scott No 167. Yvert No 173. Hydrological Decade. COMPLETE SHEET OF 25 TRIAL COLOR PLATE PROOFS with color codes in the margin. **. Only 13 complete sheets printed therefore probably the only sheet still intact as most are cut for strips or singles.
AVAILABLE AT $300
IVORY COAST (1972) Jacqueville Lake*. Palm trees*. Trial color plate proofs in strip of 5 with multicolor. Scott No C52, Yvert No PA58. Not easy to find!
AVAILABLE AT $75
MONACO (1971) Theodolite*. Underwater scene*. Trial color proofs in strip of 5. International Hydrographical Bureau. Scott No 804, Yvert No 861.
AVAILABLE AT $100
MONACO (1981) Oceanographic Institute 75th anniversary*. Trial color proofs in strip of 5. Scott No 1283, Yvert No 1278.
AVAILABLE AT $80
MONACO (1981) Hydrographic bureau*. Trial color proofs in strip of 5. Scott No 1284, Yvert No 1279.
AVAILABLE AT $80