This 1849 stamp is a very rare pair from the classic series of Ceres from 1849-1850 period. At present, only 4 unused copies are known to the philatelic community. This lot was previously kept in the famous collection of Ferrari for many years. It is important that this copy was not printed this way intentionally but is a plate error, which makes it extremely rare and valuable. on June 19, 2010, the lot was sold at one of the Robert A. Siegel auctions for US.$.190,000
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