Post-war broadcast-band 5-valve mantle radio.
The awesome-looking Haywin Broadcaster was built for Hay's Dept Store in Christchurch. The manufacturer is most likely to have been Radio Warehouse in Christchurch as the dial on early Broadcasters is the same as that commonly used in Austin sets, and the chassis paint colour as well as the date stamping inside the chassis are identifying features of RW sets.
Chassis Notes (most schematics can be clicked to download a full size version): Date appears to be rubber stamped in the underside of the chassis, serial number stamped into the metal on the back
General Construction Notes for Radio Warehouse Ltd: Often chassis will be painted an olive green colour, and the manufacturing date can be found rubber-stamped inside the chassis itself.