WW2 U.S. Navy Binoculars

I have this great pair of WW2 binoculars. They have the original case as well. They are marked U.S. Navy BU Ships,universal camera corp. Mark 33 model 1 N 1944. These are 6x30 and are almost mint like in shape for the age and they work like a dream. Don't know much on the maker , does anyone else. Do they hold value? Any info will help.