I have what appears to be a throttle handle that ws given to me some time
ago, and I would like to try and work out what it is from.

The handle has a button in the centre with Push to transmit.

The main body is stamped
PA4-47
AB5837U
219 (in an oval)


There is also the stamp
B516137

Any help as to the type it might be from would be great.

Johnnie