The Columbus model 19 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1949.

5-valve broadcast band tablegram, featuring "Extended Frequency Featherweight" pickup.  Possibly this refers to the Columbus turntable, models have been sighted with various turntables in them so its not clear, although JWS refers to the 19P as having a 3-speed belt-drive RCNZ turntable with 2 plug-in heads so at least that model does.

Model 19's ran for several years and there were 19R, 19N and 19P variants as well.

Cabinet: highly polished walnut

Columbus model 19 'Dover'

Valves (5):
19 & 19R: 6A8, 6K7 or 6U7, 6Q7, 6K6, 6X5
19N & 19P: 6BE6, 6BA6, 6AV6, 6AQ5, 6X4

Intermediate Frequency: 455kc/s

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

19 : gram switch is toggle beside platter

19R : gram switch changed to rotary type, incorporated with tone control

19N : Updated to use miniature valves

19P : 3-speed RCNZ belt-drive turntable

1949 Columbus model 19 Schematic

1949 Columbus model 19R Schematic

1949 Columbus model 19N 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.

All documented models using this chassis (2 in total)

1949Columbus model 19 - this set
1950Courtenay model 19