C4P

34 (literally "Half-track car, year 1934 model") was a Polish halftrack lorry.

It was produced in a variety of variants, the best-known of them being the C4P artillery tractor used by the Polish Army in the period before World War II.

In 1934 Edward Habich of the Bureau for Technical Studies of the Armoured Arms (BBT BP) designed a half-track version of the Fiat 621 lorry, initially dubbed the Mark 1934 halftrack cargo lorry (Polish: Półgąsienicowy samochód ciężarowy wz.

34 shared the majority of parts, notably the slightly modified frame, the engine and the crew compartment.

The front axle was reinforced, a reduction drive was added and the gearbox was modified to better suit the new vehicle.