The guns were built by Armstrongs (Elswick Ordnance Company) and were originally intended to be mounted as a pair in a twin turret on the Japanese battleship Yamashiro but the order was not completed.
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The Sparrowhawk entered service with the Japanese Navy in 1921, with the 10 Sparrowhawk IIIs being used for flight training operations from ramps built on one of the gun turrets of the Battleship Yamashiro, as the carrier Hōshō was not yet ready.