Pacific Express Co., Volcano., Jul 6, blue oval date stamp (PAC-102) tying four margin 1851, 3¢ dull red on cover to Noisy Carrier in San Francisco, with the very rare Pacific Express pony & rider type PAC-001a frank applied to a non-government envelope due to the shortage of government entires; tear in backflap, Very Fine, this rare franked envelope has only been recorded from four locations with only six examples known. Estimate  $300 - 400. $0 (Image)