5¢ Orange Brown (1b), with huge top left corner sheet margins, left measures 5.5mm and top measures 6.5mm, bottom and right both with large margins, tied by blue "Baltimore Md. Apr. 24" (1851) circular datestamp on greenish folded letter addressed in blue to Mt. Vernon, Ohio, manuscript "Paid 5", heavy file folds, one of which falls near but does not touch stamp which has a few pinpoint raised indents, Extremely Fine Gem corner-margin stamp on cover and one of the largest on-cover examples in existence, ex Knapp, Gibson, Rohloff and Boker, and from our 1974 Rarities of the World sale

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