COLUMBIAN CENTINEL, Boston, Jan. 31, 1818  This issue contains on the back page a rather small, classified-type ad with a small heading: "GUITAR" with the text of the ad reading: "For sale cheap--a new, elegant and superior toned English Guitar, together with instruction book, strings, etc. Inquire at the Centinel Counting Room".
Have you ever seen an earlier ad for a guitar? A folio-size, 4 page issue, complete and genuine. Some dirtiness at the edges, otherwise nice condition.