This piece, one of a pair, was held by Royal Air Force Calshot until its closure in 1964. It was handed to the Royal Air Force Andover for display at Headquarters Maintenance Command.
Whitworth, number 315, is now part of the Royal Armouries collection at Fort Nelson, UK. Number 316 is part of the George Wray Collection at the Atlanta History Centre, USA. The latter is mounted on a replica brass mounted naval carriage, copying the original held by the Royal Armouries.
It is probable that the pieces were manufactured for use on a privately owned yacht.