London: printed for Longman, Rees [et al.], 1818. First edition, first issue, of the first revision of Johnson's Dictionary, 5 volumes, 4to, engraved portrait of Johnson by Hollar after Reynolds, text in double column; full contemporary polished tan calf, black morocco labels on gilt-decorated spines; slight cracking at spine ends, some scuffing to a couple of the boards, and the joints, while without gaps, are becoming tender; a very good, attractive set, with all the half-titles present (see below). Early owner's signature of William Williams on title pages. The first (5-volume) issue is far scarcer than the 4-volume issue of the same year. In it, volume 5, beginning with the letter T, contains the addition of a drop title at the top of leaf B1. B1 here corresponds to 6L3 in the 4-volume issue where leaf 6L3 is signed "Vol. IV 6L3 - Vol. V. B." On the title pages of the 5-volume version is the statement "In Five Volumes," as opposed to "In Four Volumes" in the 4-volume issue.…