A US 1851-1856 1c blue stamp is among the top lots in Robert A Siegel's April 28-30 sale of the Robert A Hall collection in New York.
It's expected to make somewhere in the region of $71,000.
Siegel explains the lot is "the only one of the 1,000 positions used to print imperforate one-cent stamps that shows the complete design (type i). A great rarity."
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