Periscope, Type M6, for Armored Tanks Sherman, Stuart C-119 In this specimen

In this specimen

likely indicating a manufacturing year of 1950

I have also confirmed its use in the P-2E by its parts manual dated 1966

DC 0-400 Microamps Westinghouse style CH-10533-N3-1 approx 3

BT-13 Valiant

Periscope, Type M6, for Armored Tanks Sherman, Stuart C-119 In this specimenHere is a fine specimen of the Periscope, Type M6, as used in US WWII era armored tanks such as the Sherman and Stuart. From the website The Sherman Tank: " there were 12, M6 periscopes in each late model Sherman. Six mounted in in various places, one in the drivers hatch that rotated, and a fixed one in front of him. The co driver had the same layout, just on the other side, he used the hatch or fixed periscope to aim the bow machine gun. The loader