1872 (Feb. 17) Hong Kong, China to Mazatlan, Mexico via San Francisco, blue folded cover docketed "Hong Kong Feb 17, 72" and flap with "Semssen & Co., China" merchant two-line handstamp, carried trans-pacific by private ship, entered mails bearing two 1870, 6¢ carmine (148) singles cancelled by cross-roads, magenta "San Francisco Cal. 'Paid' Apr 11" exchange cds, Mexican "1" reale due handstamp for inland postage due, Very Fine. Estimate  $7,500 - 10,000. THIS IS THE ONLY RECORDED BANK NOTE USE FROM CHINA VIA THE UNITED STATES TO MEXICO. Only one other cover from this same correspondence is known, it is datelined Hong Kong, China on May 20, 1868 bearing 1861, 10¢ green (Scott #68) to J. Kelly & Co. in Mazatlan, Mexico. $0 (Image)