Alum. Round 2-dog porthole

Salvaged Aluminum porthole salvaged from ship- round 2-dog portholes. Approx 17 1/4 Outside Diameter, approx. 14 lbs. 

Portholes come with 2,3, or 4 "dog ears" or "dogs" for short (also known as "keys" which batten down the window to the sash.