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0.0000000280 square perches is about one-five-hundredth as big as a Postage Stamp
In other words, the size of a Postage Stamp is 500 times that amount.
(average; United States dimensions)
A typical postage stamp measures an average of 0.0000200 square perches. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
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