The Columbus model 94 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1939, production ran for 2 years.

5-valve broadcast band radio.

It seems like a dial change occured during production, changing from a rounded dial to a rectangular one.  This change is noted in the model 95 (dual-wave version) as well.\

1939 Columbus model 94

Valves (5): 6K8G, 6K7G, 6B8G, 6F6G, 5Y3G

Frequency Bands: 1

Chassis Notes(most schematics can be clicked to download a full size version)

Similar to model 54 only without pushbuttons, same as 95 which is dual-wave version

1939 Columbus model 94

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.