This is an injection-plastic military vehicle model kit.
Developed to counter the Russian IS-3 tanks, the British Conqueror series of tanks was a heavy tank from the early days of the Cold War. Rather than develop their own heavy gun the 120mm cannon found in the Conqueror was the same 120mm gun developed by the Americans for the M103 heavy tank. The era of heavy tanks didn't last too long as both the Conqueror and the M103 were phased out in favor of more mobile and capable main battle tanks.
This kit from Amusing Hobby represents the FV 214 MK II variant with its improved exhaust and frontal armor compared to the MKI. Includes photo-etched parts!