The Columbus model 35 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1938.

The Columbus version of the model 35 has two distinctly different styles due to two different chassis versions.  It appears the early version uses an escutcheon and round dial-style as found on older models like the 1937 model 38 spiral dial set - with mechanical 'eyes' showing the volume and tone settings.  This appears to have been removed in favour of a simpler oval dial design with no other indicators other than the magic eye on the later sets.

Valves (5 + eye):
Early Version: 6A7, 6D6, 6B7, 42, 80 + 6E5 Magic Eye
Later Version: 6J8G, 6K7G, 6B8G, 6F6G, 5Y3G + 6E5 Magic Eye

Intermediate Frequency: 456kc/s

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

Two known versions of the chassis - the first used 6- and 7-pin valves while the later revision uses octal valves and (at least in the Columbus version) has a simpler dial assembly.

1938 Columbus and Courtenay model 35 Schematic

1938 Columbus and Courtenay model 35

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.

All documented models using this chassis (2 in total)

1938Courtenay model 35
1938Columbus model 35 - this set