transit datestamp on cover to White Pigeon, Michigan, originating from the mines with "Hinckley & Co.'s Express Denver City Jul 19 1860" datestamp, transferred to the COC&PPE for carriage from Denver to Leavenworth City, Kansas where it entered the mails with an 1857 3c Dull red tied by July 26 datestamp, very fine, Hinckley & Co. did not begin competing with the COC&PPE until September 1860
Provenance: Hall