Gregory's Express Office, San Francisco, sharply struck blue express company marking in three straight lines, matching 'Paid' in double oval, also local delivery oval 'Boyd's City Express Post' datestamp and matching 'Paid J.T.B.', on brown cover to New York, light edgewear, otherwise quite fresh and very fine, very scarce in this condition, attractive combination of trans-continental and local delivery express markings, carried completely out of the U.S. mail