The 'Briton' brand was introduced in NZ in around 1934 and lasted until around 1936.
'Briton' branded equipment was manufactured by General Radio Ltd,
they were distributed by Briton Trading Co..
There was also a Briton Radio in Australia - no actual Briton Radio models sighted in the flesh, and while there is plentiful advertising its not clear which is NZ made and which is not.