Unitrade #2TCxi, 1851 6d Grey blue, trial color plate proof on India on card, overprinted "SPECIMEN" vertically in carmine, block of four, clear to large margins, fresh and fine-very fine.
Unitrade #2TCxi, 1851 6d Grey blue, trial color plate proof on India on card, overprinted "SPECIMEN" vertically in carmine, block of four, clear to large margins, fresh and fine-very fine.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
