These binoculars are the creme de la creme of World War II optics. The dimensionality of the picture is unbeatable. This pair clearly demonstrates why Carl Zeiss is known as the preeminent lens-maker. These were used defensively by the German Navy, and are very rare due to the fact that most found their fates at the bottom of the sea. As with all our binoculars, these have been hand polished to illuminate the original steel and brass metals. These are the most sought after WWII optics. These Kriegsmarine binoculars were marked blc the code for Carl Zeiss Jena. All lenses are marked T for coated lenses.