(Pacific Maritime Mail) Nicaragua Line/In Advance/Of The Mails. Bold strike of oval handstamp on cover to Stockton with franked with two 1851 3¢ dull red (top stamp large margins, tiny tear, bottom stamp defective) cancelled with manuscript strokes, cover handed over to Adams Express company for transmission to Stockton with their blue oval handstamp of San Francisco over the Nicaragua marking, Extremely Fine, This cover is one of only a very few incoming covers from the East, which was handed directly to Adams & was never handled by the Post Office, illustrated in Ashbrook Vol. II, which states, "Covers showing via Nicaragua marking that traveled from east to west are extremely rare.", he goes to state that he has seen only four covers with this Via Nicaragua marking going in either direction. Estimate  $1,000 - 1,500. $0 (Image)