Adams & Co. Express, Humboldt Bay, bold double-lined blue oval handstamp (Thomas ADA-103) with matching boxed "Paid" at left on cover to Moquelumne Hill, franked with precancelled 1851, 3¢ dull red with blue double circle "Adam's & Co, San Francisco" transit datestamp (ADA-100); portion of cover cut out and repaired with stamp placed over (which may not originate), Very Fine appearance, the Unique Example of the Adams Humboldt Bay Handstamp. Scott No. 11A  Estimate $750 - 1,000. This cover was carried by steamer from Humboldt Bay to San Francisco then carried by Adams to Mokelumne Hill. $0 (Image)