One of Columbus' first Transistor portable sets from 1959. Not as commonly found these days as its big brother, the PZ-117
It's unusual that while these two sets were often advertised together, they look significantly different to each other, and have vastly different model numbers.
Valves (6 Transistor, 3 Diode): 2N412, GEX34, 2N410, GEX34, 2N410, GEX34, 2N408, 2N270, 2N270
Intermediate Frequency: 455kc/s
Service information (Columbus_694P_Transistor_6_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.