[Hawaii via California and OMC Route to Blockading Squadron off Mobile in 1864], cover addressed to U.S. Steamer Sebago, Blockading Squadron, Mobile, Alabama, franked with Hawaii 5c Blue (#9) and two copies US 3c rose (#65), Honolulu US Postage Paid Aug 27 datestamp, on arrival in San Francisco the cover was rated as an unpaid steamship cover and received the "Foreign" handstamp and "Due 4" markings, stamps cancelled by San Francisco Cal Sep 23 cogwheel duplex, after overland carriage the cover arrived at New Orleans, reverse with "New Orleans Free Nov 18" postmarks and "ADV. 1" advertising handstamp (image here), PF cert, an extraordinary and important use

ex Honolulu Advertiser (1997 sale) and Walske (Image)