6-valve, 5-band bandspread radio.
The date of the set is an estimate from the Rola speaker code (25G1). The 'F' on the ARTS&P label indicates 1939/40 - but Bandspreading was only introduced in late 1939/1940 in the model 75 from Radio Corp NZ with other brands following suit from 1941.
The model code appears to be stamped on the chassis by the speaker plug (it could also be the serial number, but this is an unlikely small number given the size of Westco).
Frequency Bands: 5
Chassis Notes(most schematics can be clicked to download a full size version)
This model looks to have a separate RF sub-chassis remeniscent of the Philco models from 1937 / 38
General Construction Notes for Westco Products Ltd:
Often the model number will be stamped into the metalwork in the back, in front of the serial number - ie: if you find 126 3454 then its probably a model 126. This is not always the case, but its pretty common. Often a different number stamp will be used as well, so the model code and the serial number will be in different 'fonts'. Here are a couple of examples: