Stamps of Rhodesia, 15th World Plowing Contest issue
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postage
1968, Apr 26 15th World Plowing Contest issue unwmk
| X | 3p | multi | wooden hand plow, 1820, p. 14.5 | .20 | .20 | |
| X | 9p | multi | ox-drawn plow, 1860, p. 14.5 | |||
| X | 1sh6p | multi | steam tractor, 1905 | — | — | |
| X | 2sh6p | multi | modern tractor plowing, 1968 | — | — |
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