DIBDIN, Thomas Frognall. The Bibliographical Decameron; or, Ten Days Pleasant Discourse upon Illuminated Manuscripts... London, 1817. 3 vols. Large 8o. (280 x 190 mm.) Three frontispiece portraits (Dibdin, the Duke of Roxburghe and Earl Spencer) each with proof before letters. Numerous reproductions. EXTRA-ILLUSTRATED with proof-before-letter engravings of 10 plates and one portrait, 7 extra plates including the Lewis plate originally intended but not ready at publication (Jackson p. 32), an original pencil sketch for the head-piece of the introduction on an early typesetting of the same, an ALS from Dibdin to the bookseller Triphook, Kingston, 1815 4 pp. 8 o ("...does your heart not melt with compassion at the exhausted state of the finances of the author...") and a rare 4-page prospectus on the present work. Full brown morocco by Riviere & Son, gilt-ruled, spine richly gilt. LARGE-PAPER COPY, one of 50 only. A lovely example of "one of the monuments of typographical bibliography" (Bigmore and Wyman, Vol. 1 pp. 169-170). The only edition as Didbin destroyed the plates at a meeting of the Roxburghe Club. "A bibliographer's classic" (Hart no. 186). Provenance: Hely-Hutchinson (bookplate).