Undated, possible that Dupont issued it around the time of the Gutenberg quadricententary, ca. 1836. Octagonal 1-1/2” (38.1mm) diameter. Verso with images of Gutenberg and Senefelder and reading
“Guttemberg 1436. Senefelder 1796. Recto with PD Monogram and laurel wreath reading in border “Imprimerie. Librairie. Lithographie. Paul Dupont Et Cie. A very rare medal.