Mark 2 1940 Dated  Anti-Tank Rifle Round. Manufacturer Kynoch

The Boys Anti-Tank Rifle was a powerful anti-tank weapon used during World War II. Developed in the 1930s by Captain H.C. Boys, it was intended to counter the increasing threat of armored vehicles. The rifle was quite hefty, weighing around 36 pounds, and it fired the .55 caliber Boys Anti-Tank Rifle Round.