10c Black (2). Large margins to ample, bright shade, tied by red square grid cancel and matching "New-York Mar. 18" Ocean Mail style circular datestamp on buff envelope to Mt. Vernon O., 1850 docketing at left

FRESH AND VERY FINE. A RARE USE OF THIS NEW YORK MARKING ON AN 1847-ISSUE COVER.

This style of circular datestamp was made by modifying an old device which contained the word "Ship" at bottom. The marking would later be used on Ocean Mail carried by contract routes from New York to the West Coast via Panama. It saw occasional use starting in 1850 on domestic and cross-border mail.

Ex Hart, Boker and Gross. With 2013 P.F. certificate

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