Union Square Post Office, New York N.Y., 1c Black on Light Apple Green (141L2). Large margins to just touched at right, used with 3c Brownish Carmine (11), ample to large margins, neatly placed at opposite corners of cover to Chicago Ill., each stamp tied by "New-York Nov. 10" circular datestamp, with original letter from Elizabeth Blackwell (reputed to be the first female physician in America) datelined Monday evening, Nov. 8 (must be 1852), Extremely Fine, a very choice tied usage -- although other covers are known with this local tied together with the 3c 1851, this is unusual because the datestamp was struck a second time to cancel the Union Square stamp, ex Abt
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E. 750-1,000