Berford & Co. California Letter & Package Express. Full clear red shield handstamp on cover to Washington D.C., entered the mails with bold "New - York, Jul 18, 5cts." integral rate cds, 1851 docketing; cover soiling, reinforced edge wear and missing backflap, Fine, a very rare transcontinental usage. Estimate  $250 - 350. $0 (Image)