A Model of a t-class Submarine

Constructed from solid brass with fore and aft planes, air tanks, conning tower with snorkel, periscope and quick firing gun, twin prop-shaft with propellers and rudder, mounted on a Bakelite stand.

Literature: Taken from Wikipedia.
The Royal Navy’s T class (or Triton class) of diesel-electric submarines was designed in the 1930s to replace the O, P, and R classes. Fifty-three members of the class were built just before and during the Second World War, where they played a major role in the Royal Navy’s submarine operations. Four boats in service with the Royal Netherlands Navy were known as the Zwaardvisch class.