QF 3.7-inch AA gun
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The QF 3.7-inch AA was Britain's primary heavy anti-aircraft gun during World War II. It was roughly the equivalent of the German Flak 8.8 cm and American 90 mm, but with a slightly larger calibre of 3.7 inches, approximately 94 mm. Wikipedia
Barrel length: Mk I–III: 15 ft 5 in (4.7 m) L/50; Mk VI: L/65
Calibre: 3.7 in (94 mm)
Crew: 7
Designed: 1937
Elevation: −5 to +80 degrees
Height: 8 ft 2 in (2.5 m)