The engraving itself is a very early 19th century engraving from a Natural history book. The artist and publisher are not apparent. This is possibly covered by the mat. The bird is identified as a Gigantic Hummingbird. The opening in the mat is 7" x 4 1/2". The overall size is 17 1/2" x 15". It has been professionally framed and matted. Excellent condition. I have a companion listed.