Wilmington, New Hanover County, September 6, 1860, envelope with two 3-cents 1857, dull red stamps and a 24-cents 1860, gray stamp paying the 30¢ rate by Prussian Closed Mail from Wilmington to Puschdorf, East Prussia. Wilmington applied a Type 9, 31.5 mm postmark in black and the New York exchange office credited 7¢ to Prussia for this single-rate letter with a red N.YORK AM.PKT postmark.
