Principal, with founder Allan Pinkerton, of the renowned detective agency that bears their name. Vintage 6 x 8.5 photo of Pinkerton by Gibson Art Galleries of Chicago, signed in fountain pen, 'Very sincerely yours, Wm. A. Pinkerton.' In fine condition, with some light skipping to a couple letters of signature and inscription. COA John Reznikoff/University Archives and RRAuction COA.
