I photographed an SdKfz 251 Halftrack at the IWM Duxford, which is actually an OT-810 — the Czech-built version made by Praga and Tatra, with about 1,500 vehicles built during years 1958-62. This version had an air-cooled diesel engine and an armored roof over the troop compartment. The vehicle was not liked by those who used it and was nicknamed “Hitler’s revenge”. The last vehicles were removed from Czech Army magazines in 1995.