DE QUINCEY, Thomas, letters, autographs, documents, manuscripts Home | Archive | Facsimiles | Forgeries | Back DE QUINCEY, Thomas (1785-1859). Writer. Autograph Letter Signed to Charles Mackay, 'May 21', no year. [No: 25847] This is the archived description of an item that has already been sold. Please contact me if you would like any further intormation.