A buyer's premium equal to 10% of the successful bid price of each lot is payable by the buyer as part of the total purchase price.
CLASSIC RARITY: GJ.31, 15c. imperforate, additional 6th printing, mint, with circular mark on back of the Jefatura de Correos and part of the hand-written inscription "Muestras de impresión", excellent quality, very rare, with certificate of Kneitschel. NOTE: Of the few known unused examples of 15c. of the additional 6th printing, only about 5 or 6 are known with these 2 marks on back!
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