5-valve broadcast-band radio.
Serial number above shows manufacture in 1939, however 1939 Courtenay models typically all had large aero dials, slide rule dials were not introduced until the 1940 season. The ARTS&P label is also indicative of 1940. The chassis is also very deep, similar to the model 94 and 95 from 1939. And the triangular dial layout is the same as 1939 models. Finally, it is extremely similar to the Columbus model 95 with rectangular dial
It is likely that the slide-rule dial was a production change from an original aero dial or it was simply a test implementation of this new dial design. If anyone has an aero-dial version of this set please send information.
This set is likely to be very similar electrically to the model 94
Frequency Bands: 1
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.
Model codes beginning with a 0, for example the model 051, are Osram valve versions of the model without the leading 0. Technically the 0 should be an O (for Osram), however the digit 0 was used throughout the site before this fact was discovered.
The E suffix indicates a magic eye option is fitted (in models which were available with or without, such as the model 25).
A and B suffixes appear to be simply updates to the current model, R also appears to be simply an updated model ('R'edesign, perhaps?)
P indicates either a permanent magnet speaker version of a model which also came with an electromagnet speaker (the model 26 for example), or a portable model (like the model 694P).
N and M indicated miniature valve versions of a model which started with all (or a mix, ie: model 5) of larger valves. One of these two codes may indicate a transitional mixture of octal and miniature - clarification is required.
S often indicates a stereo model. It can also indicate 'self-biased' in the transition period between back-biased and self biased sets where there were models with both methods employed (53S for example)
Finally, other suffixes and prefixes make occasional appearances in the RCNZ lineup - like the 66W (a variant of the long-running model 66) and the 75XA (a 10-valve version of the model 75 with a separate amplifier chassis).