The Philips P516 was manufactured by Radio Corporation of New Zealand Ltd in about 1935, production ran for 2 years.
Released in two different cabinets - made for Philips by RCNZ, used Philips moulded bakelite knobs and Philips valves.
In advertising, refered to as 516P, in technical literature and the chassis tage its P516. The 'P' could either be Philips or P-base valves (or both).
Valves (5): EK2, EF5, EBC3, EL3, EZ3
Intermediate Frequency: 465kc/s
Chassis Notes (most schematics can be clicked to download a full size version): Some use red series (6.3V) P8-base side-contact valves, one example seen used gold series 4V versions. Schematic from RCNZ shows red series.
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.