[Boston ?]: Leander Baker, Photographer, (n. d.). Ca 1874 / 75. Two square albumen images of cannons in the Navy Yard. 3-9/16" x 6-15/16. Slightly concave orange mount, round corners, with blank violet back. Hint of age-toning & soiling to card. Images slightly dull, but not excessively so. A solid VG copy. Item #49688
"The Charlestown Navy Yard, later the Boston Naval Shipyard, was one of the oldest shipbuilding facilities in the United States Navy. It was established in 1801 as part of the recent establishment of the new U.S. Department of the Navy in 1798. After 175 years of military service, it was decommissioned as a naval installation on 1 July 1974." [Wiki]
Date of image inferred from the years Baker worked in Boston.