Columbus 5-valve radiogram. Mono but able to be extended to stereo, possibly using the 'Stereo Pal' or some other second channel extender kit. Apparently has a 2-gang volume control fitted.
Intermediate Frequency: 465kc/s
General Construction Notes for Radio Corporation of New Zealand Ltd: The first digit of the serial number typically indicates the year of manufacture of RCNZ chassis' (although not the decade - that requires a little knowledge of the valves, construction, etc). Sets from around 1934 onwards were often (but not always) constructed in a distinctive pressed 'baking pan' style chassis, seemingly unique to RCNZ.