Nice original aluminum ship’s porthole that has been cleaned. Wall mount ring measures 17 3/4 inches. The glass measures 13 1/2 inches and has some cloudiness or blackish looking areas near the frame sides – these old portholes took a beating on the seas!  The flange on the back extends out from the frame by just under one inch. This is a non-opening porthole. Weighs about 12 pounds.