Original albumen card photograph, 4 x 3.5, of famed detective and spy Allan Pinkerton and members of the Secret Service, taken at Antietam, Maryland in 1862. Sharp and clear first generation is affixed to its original 5.5 x 7 cream colored blank backed mount. Various pencil caption notes back to front. Edge and corner wear and general light aging. RR Auction COA.
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