Visibility zero unless you lend your binoculars to the navy 6 x 30 or 7 x 50 Zeiss or Bausch and Lomb : Pack carefully and send to Navy Observatory, WBuy wall art of this image titled: Visibility zero unless you lend your binoculars to the navy 6 x 30 or 7 x 50 Zeiss or Bausch and Lomb : Pack carefully and send to Navy Observatory, Washington, D. C., from the WPA Posters Collection by Second Story Prints. Top quality print reproductions available now! Tags World War, 1939 1945 Equipment & supplies. Binoculars 1940 1950. Naval warfare 1940 1950. Notes Work Projects Administration Poster Collection