Control grip identification????

Hi all,

This grip has been in my collection for a while and appears to be in an un-issued state but, I can’t seem to find an application/use for it. It is most likely to be of rotary wing persuasion however, help required!

The switch on the back of the handle moves from left to right in a three position way and the big red ‘trim’ switch moves in the usual 4 ways. The switch on the top left ‘rocks’ in a hoist up/down motion.

Any help much appreciated.

Martyn