[kiwi_steve]

Thanks guys - and the mystery deepens, but maybe things are a little clearer... I will need to bounce this off a few people in the know here in NZ.

[Image: http://i241.photobucket.com/albums/ff222...xtf9ej.jpg]

The chassis is originally from a 'farm set' - given the tag on the back.  I ignored this because it all looked wrong - but the radio is most likely from Central Otago - a remote (by NZ standards) gold-mining and farming area back in the day... they never got mains power until very late in the piece, so its possible that the service tag was modifying the radio for the new fandangled 'lecy-tricle wires that they got.  The 2V filament setup is gone, a power transformer added - and then a second one for a 5Y3 underneath - the chassis has been cut up to accommodate this.  New sockets have also been fitted, rather shabbily it seems.  Add to this that the IF cans are not a good fit either - so they might have been replaced.
[Image: http://i241.photobucket.com/albums/ff222...ip3qkf.jpg]

[Image: http://i241.photobucket.com/albums/ff222...cmvmsa.jpg]

So, it could indeed be a standard tag for the cabinet, with a farm set chassis fitted (I'll look into the chassis that were available in that era from Radio Corp NZ and see what might fit).  That chassis has then been heavily modified to suit mains at a time when more modern tubes would have been available to replace the old battery ones.
[Image: http://i241.photobucket.com/albums/ff222...swqylt.jpg]

I'm thinking at this point I will probably strip the chassis and rebuild it again properly as a 6-valve mains set, following the Columbus model 18 circuit but the Pacific chassis layout because they are pretty close and its likely a variant of this that the Pacific sets had.  This is likely the best I will be able to do unless I magically stumble upon a Pacific chassis - but the likelihood of that is very slim... and if I do then I can swap them out when that happens.

[Image: http://i241.photobucket.com/albums/ff222...lqjvph.png]
Columbus model 18 circuit

[Image: http://i241.photobucket.com/albums/ff222...anfxpa.png]
Columbus model 18 chassis