Two copies of this edition are displayed. The first in the original publisher's paper covered boards. Leaf size 204 x 127 mm. Signed "Dr. Wheeler 12. 6. 1784" in Vols. I and IV.
The second is also a first printing of the same edition, 5 volumes, 198 x 125 mm, but lavishly bound in 19th century red morocco by Chambolle-Duru.
According to the DNB, Dr. Tyrwhitt (1730-86) "significantly advanced the understanding and appreciation of Chaucer" in this era. His edition was considered in its day to be "'the best-edited English Classic that ever has appeared.'" (DNB, quoting the "Gentleman's Magazine"). Many fine press editions through the mid 20th century used the Tyrwhitt edition as their Middle English text.