Naval leader (1809–1870) who headed the Union Navy's ordnance department during the Civil War and developed a number of guns and cannons. Civil War–era ALS signed “J. A. Dahlgren,” one page, 4.75 x 7.5, April 2, [circa 1863]. Letter to General Joseph Hooker. In full: “I am much obliged to you for your polite attention in regard to another nine inch gun discovered by your men.” In fine condition, with intersecting folds. Pre-certified PSA/DNA and RR Auction COA.
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