Head of the Union Intelligence Service during the Civil War who later founded the first detective agency, the Pinkerton Agency, whose open-eye logo is thought to have been the inspiration for the phrase ‘private eye.’ Ink signature and inscription, “Major Duane, Army of the Potomac, with respects of Allan Pinkerton” on the reverse of a 4 x 2.25 carte-de-visite of George B. McClellan. Scattered light foxing and soiling, otherwise fine condition. Duane was a Chief Engineer of the Army of the Potomac from 1863–1865 who built the first military pontoon bridge over the Potomac at the Battle of Harper’s Ferry. An uncommon format with Civil War association. Pre-certified PSA/DNA and RR Auction COA.
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