J.W. Sullivan's Newspaper Office, Next Door to the Post Office, Kearny St., San Francisco. Double oval handstamp on backflap of cover to Farmington Falls, Me., franked with 1851, 3¢ dull red, horizontal pair tied by two strikes of Boston large "Paid" in grid handstamps, Very Fine, a very scarce Sullivan handstamp on cover via Nicaragua and entering the mails in Boston, Mass. Scott No. 11A  Estimate $500 - 750. $0 (Image)