QF 1 Pounder Pom-pom
The QF 1 pounder, universally known as the pom-pom due to the sound of its discharge, was a 37 mm British autocannon, the first of its type in the world. It was used by several countries initially as an infantry gun and later as a light anti-aircraft gun.
Read more about QF 1 Pounder Pom-pom: History, German Service, Belgian Service, United States Service, Surviving Examples