Proof Specimen Block of Four 12½c. yellow-green top left corner block of four backed on card, each overprinted "SPECIMEN." in carmine vertically, fine | Christie's

Lot 171

171

Proof Specimen Block of Four 12½c. yellow-green top left corner block of four backed on card, each overprinted "SPECIMEN." in carmine vertically, fine

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Proof Specimen Block of Four 12½c. yellow-green top left corner block of four backed on card, each overprinted "SPECIMEN." in carmine vertically, fine

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