Lot 31691853 (Jul. 12) Philadelphia Pa. to Cape Verde Islands, orange buff cover addressed to Purser U.S. Frigate Constitution at Porto Grande, St. Vincent, red "Philadelphia Pa., Paid, Jan. 12" cds and red "Paid" double-octagon handstamp with manuscript "65" prepaid rating, New York crossed out the rating and updated with magenta "60" credit, red "New York Br. Pkt. Jul 13" exchange cds, carried by Cunard Line Africa from New York Jul. 13th to Liverpool arriving Jul. 24th, London "Paid" (7.25) transit cds, docketed as received Dec. 18th; wax seal stain, Very Fine usage paying the 65¢ rate by British mails via England.
Estimate $500 - 750.
The U.S. Navy's Africa Squadron operated antislavery patrols, in cooperation with the Royal Navy's West African Squadron, along the west African coast from 1819 to 1861. The American squadron was based at Porto Grande in the Cape Verdes.