VINTAGE 20" SOLID BRASS AUTHENTIC 4 DOG PORTHOLE

For sale is a 20" VINTAGE SOLID BRASS PORTHOLE. This is an original and not reproduction. Weighs about 44 lbs. Has 4 dogs that unscrew easily and hinge works fine. Could not find a maker mark. Stamped "51" on the edge. Glass is in good shape. It has one tiny impurity near the outside edge (see picture). Seal is deteriorated and there is some caulking residue. Great Condition...Nice patina. Being sold "AS IS & AS SHOWN" as pictures are worth a thousand words.