1860-63 5c. green and 10c. red imperforate plate proof marginal blocks of four on card, overprinted "SPECIMEN" in sans-serif capitals in red and green respectively; 1860-63 2c. orange, 5c. yellow-green (2) and 10c. unused blocks of four, the last with part original gum
1860-63 5c. green and 10c. red imperforate plate proof marginal blocks of four on card, overprinted "SPECIMEN" in sans-serif capitals in red and green respectively; 1860-63 2c. orange, 5c. yellow-green (2) and 10c. unused blocks of four, the last with part original gum
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
