United States. (Panama). 1851. stamp-less envelope written from San Francisco date 'Sept 12th 1851' addressed to London with British Post Office 'Panama' date stamp 'Oct 7' and rated '2s' in m/s. with London receiver '11th Nov ' on reverse. Nice item written by Captain Edward Fanshawe commander of the "Daphne" with interesting account on San Francisco life during the Gold Rush.