This is a desirable example of a World War II 15 cm Nebelwerfer (translation "smoke thrower") 41 multiple rocket launcher, as used in German military service between 1941-1945. Better known as the "Screaming Mimi" or "Moaning Minnie" by Allied troops who encountered it due to the characteristic high pitched screech made by incoming rockets. This launcher has six tubes that use smoke, high explosive and chemical 15 cm Wurfgranate 41 projectiles (158mm, 6.22 inch), which are spin-stabilized and have a rocket motor located in the front and exhaust venturis on the lower half, with a maximum firing range of 4.3 miles. Reportedly around 6,000 of these launchers and a half million 15 cm rockets were manufactured during the war, with a very limited amount surviving today. The serial number and "beq 43" marked on the rear plate.