Original Item: Only One Set Available. Very good condition British WW2 issue military binocular 7 x 50 bino prism No 5 Mk IV by Ross of London. Ross, supplied the British War Department during WW1 and WW2. They are the most well known maker of the military binoculars. This model was used by the British Army and are classified as 7 x 50 Prismatic No5 MK 4. the design was derived from the Ross Stepnite, which was introduced in 1930. The military Mk IV version of 1944 could also be filled with dry air to stop condensation and fungus growth.