MONACO (1969) Hands holding wrenches. Trial color proof block of 4. ILO anniversary. Scott No 748, Yvert No 806.
AVAILABLE AT $25
TUNISIA (1957) Labor bourse*. Trial color proofs in strip of 5 with color codes in margin. Scott No 309, Yvert No 441.
AVAILABLE AT $60
FRANCE (1959) Palace of Industry & Technology*. Trial color proof in maroon. Scott No 923, Yvert No 1206. Not easy to find!
AVAILABLE AT $12
AUSTRIA (1948) Workers reconstructing*. Large essay (design measures 9 x 7.5 cm) for unissued stamp signed Wimmer. Available in a variety of colors (7 available).
AVAILABLE AT $50
CAMBODIA (1960) Dove*. Factory*. Books*. Trial color proofs in strip of 5. Scott No 84, Yvert No 94.
AVAILABLE AT $75
CAMBODIA (1960) Workman*. House*. Trial color proofs in strip of 5. Scott No 85, Yvert No 95.
AVAILABLE AT $75