OQF 3 pounder gun
Encyclopedia
The Ordnance QF 3 pounder gun was a British
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 tank gun mounted on Vickers Medium Tank
Vickers Medium Tank
The Vickers Medium Tank may refer to one of the series of tanks built by Vickers-Armstrong during the 1920s:* Vickers Medium Mark I* Vickers Medium Mark II* Medium Mark III, built by both Vickers-Armstrong and the Royal Ordnance Factory...

s in the 1920s and 1930s. The gun was produced in 32 calibre
Caliber (artillery)
In artillery, caliber or calibredifference in British English and American English spelling is the internal diameter of a gun barrel, or by extension a relative measure of the length....

(59 inch) and 40 calibre (74 inch) versions.
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