Envelope, 1861, 10¢ yellow green on buff. Perfect strike of cds on fresh 1861, 10¢ yellow green on buff entire to San Francisco, Cal., canceled by negative "U.S." cork cancel and "Per United States Mail" straight line endorsement handstamp at upper left, magenta "China and Japan, Steam Service" oval handstamp and "San Francisco, Paid All, Apr 24" entry cds, reverse with "Olyphant & Co., Shanghai, 20 Mar, 1869" forwarders handstamp; cover opened at sides for display, Extremely Fine and choice, the finest recorded 10¢ entire usage from the U.S. Postal Agency in Shanghai; with 2001 P.F. certificate. Scott No. U41  Estimate $10,000 - 15,000. $0 (Image)