5-valve broadcast model. Two versions that look very similar, but one has a reversed dial (low frequency on right instead of left).
The Collier & Beale version was also sold as the Pacemaker 519P
Intermediate Frequency: 455kc/s
At least 2 chassis variants - one of which has Philips(?) style IF cans, a miniature valve in the lineup, a different tuning cap (and reversed dial) and other differences like the orientation of the tone switch - probably one set built for HMV by Philips NZ while the other (main version) is Collier & Beale. Both sighted models have 'Manufactured by H.M.V. (NZ) Ltd'.
Service information (HMV_495BC_Little_Nipper_-_5V_BC_AC_-_1949.pdf) here