World war 2 1940s tank periscope British army this unusual item came from a tank would have been used by the driver/ gunner to see enemies etc ! 16 cm wide 7 cm tall 5 cm width some age related wear would make a fantastic desk piece/ paper weight etc see pictures price is for periscope All other items are illustration only 
The history of the tank periscope began with the 1936 patent of Rudolf Gundlach, and the first use of the periscope in the Polish 7-TP light tank. The periscope allowed the tank commander to see around the tank without leaving it. 
Early use
The periscope was used in the Polish 7-TP light tank, which was produced from 1935 to 1939. 
The periscope was used in British tanks, including the Crusader, Churchill, Valentine, and Cromwell. 
The periscope was used in American tanks, including the Sherman. 
The periscope was used in Soviet tanks, including the T-34 and T-70. 
World War II use 
Periscopes were used in tanks to allow the driver, gunner, and commander to see their surroundings and aim.
Thales periscopes were used in the fight against German battleships like the Tirpitz.
Modern use 
The periscope is considered the progenitor of all modern in-tank viewing devices.