[Arran]

 Well I have some news on my search for a schematic and model number for this set. First of all Riders has nothing on Halson sets produced prior to the 1933 model year, although some are similar electrically also being five or six tube TRFs. So I had a look in an RCA guide book that covers the chassis/tube layouts of sets produced from 1922-1935, the closest set that I could find based on the chassis layout was a model 510 from 1932, but it used a type 47 as a power output not a type 45, and I think it only had five tubes. So clearly this Halson is from the 1932 model year, but what is not clear is whether it is a model 510 from a different production run (perhaps an early model), or a completely different yet undocumented model. Unfortunately the 1932 Halson models are not listed in riders so I could not find a schematic of the model 510, which would have been useful in spite of the different power output tube, so the schematics linked to earlier are the best you can hope for.
Regards
Arran