PT-76 Soviet Amphibious Light tank

The PT-76 was a Soviet designed amphibious reconnaissance tank. Introduced in the 1950s, it was originally the standard reconnaissance tank for Soviet and Warsaw Pact forces. It was widely exported, including to North Vietnam.

Armed with a 76mm D-56T rifled tank gun and a coaxial 7.62mm SGMT machine gun.

There is a PT-76 at the IWM Duxford, just outside the Land Warfare hall.

It certainly looks like it is in working order.