20c Bright Blue Green, Presidential (825). Top left plate no. 22176 block of four, unused, traces of gum, fresh and Fine, plate number 22176 is almost assuredly the rarest plate number in 20th Century U.S. philately, perhaps rivaled only by one of the 1954 8c Liberty combination plate blocks (Scott 1041), Power Search contains one plate number single offered in our sales in the past 30 years, the plate blocks offered in this sale are the only examples we have encountered, Durland value for original-gum plate block of four is $3,500.00

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