Original authentic ship’s two dog brass porthole is unique due to the wing nut style dogs it has. The glass measures 11 3/4 inches in diameter and has wear and scratches from years of sea travel. Both wing nut style closure dogs spin on and off with no issues. Its hinged window opens freely. The frame of the porthole measures 17 3/4 inches in total diameter. The outer diameter of the back inner flange is 14 1/4 inches and extends out from the back of the frame by 1/2 inch. This porthole will extend out from the mounting surface by 2 1/2 inches, 4 1/2 inches including the dogs. It weights a whopping 50 pounds.
**There is minor pitting on the back of the glass of some of these potholes.
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The word “porthole” has nothing to with its location on the port side of a ship, but originated thanks to Henry VII of England in 1485. The king demanded on mounting guns that were too large for his ships and French shipbuilder, James Baker was brought on to solve the problem. He pierced the ship’s side so that the cannon can could be mounted inside. When there was heavy weather or the cannons were not in use, the openings in the ships were fitted with covers that latched tightly. These were called porte, which means door in French. Porte became port thanks to the English and eventually any opening on a ship was called a porthole.