There is a Wireless Set 19 WS19 RF Amplifier No 2 Mk 3 WW2 Army Military Radio on UK ebay
If you want to use this with your ws19 forget it!
It appears to reconfigured into a stand alone transmitter, almost gutted
Not saying the person has not done a fair job, although the main output aerial wire is not connected, and I can't see how it was powered up.
At 295 Quid you are really getting a show pony case and front
I bought the real deal here in aus for less money (au$450) years ago
be warned but if you want something to occupy yourself cheers rod