Early Courtenay model 5B. 5-valve broadcast band set. At some point a radio serviceman has noted that this model was similar to the 5A, but a slightly different valve lineup and made notes on the 5A schematic as seen below.
Frequency Bands: 1
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.