The Columbus model 810 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1958.

7-valve + eye dual-wave radio or radiogram, magic eye tuning.

There is a model 810S, with a different circuit - a stereogram.  This model, the 810, is mono.

The radiogram version (Somerset) of the Columbus 810 has two speakers as shown on the schematic, the table cabinet (Plymouth) has one 10" x 6" Elliptical speaker fitted.

Valves (7 + magic eye): 6BA6, 6AE8, 6BA6, 6AV6, 6AQ5, 6AQ5, 6X4 and EM80 Magic Eye

Intermediate Frequency: 465kc/s

Frequency Bands: 2

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

Service note from the schematic:

Distortion: check leakage on R/G switch - B+ to diode load

Columbus model 810 Schematic

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.