This is a part of WWII history. From Bausch & Lomb made in Rochester New York, a pair of U.S. Navy binoculars. It is stamped: Mark 28.MOD O. 134585. 1943. It is ruggedly made and shows lots of signs of use and probably saw lots of action during the war years. The glass shows some dust particles. I don't know how to test these, so they are sold as-is. If it could talk it would no doubt have lots of action stories to tell!