(Solano) Vallejo, Cal. Blue cds (SOL-1840) on three 1869-70 violet "Chief Engineer's Office, U.S. Navy Yard, Mare Island, Cal." official business imprint covers to New York, each franked with 1869, 3¢ ultramarine tied by matching cork handstamp, one with "Due 3" handstamp for double rate, original enclosures with matching letterhead; cover tear and each roughly opened at right, otherwise F.-V.F. Estimate  $100 - 150. $0 (Image)