7-valve battery set, dual wave.
Photographed model has been severely modified to run on 230V AC using octal valves, but the chassis and speaker appear original.
Valves (7): 1C6, 34, 32, 30, 32, 30, 19
Intermediate Frequency: 256kc/s
Note: 2 different versions, check position of tone control on your set
Service information (Courtenay_Pacific_and_CQ_1935_model_7BD_Service_Info.pdf) here
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.