tied by quartered cork cancel with "P.O.D. U.S. Co. Genl. Shanghai May 26" datestamp alongside on 1868 cover to San Francisco, carried on PMSS Costa Rica departing Shanghai May 26 and arriving Yokohama June 3, then PMSS China departing Yokohama June 5 and arriving San Francisco June 26, red "China and Japan Steam Service" oval handstamp, "San Francisco Paid All Jun 26" backstamp, barely reduced at right, very fine and attractive