'Astor' branded equipment was manufactured by Pye (N.Z.) Ltd, they had various distributors. Currently there are 9 documented models.

Astor was an Australian brand which was initially produced in NZ by Radio Corporation of NZ.  Either Akrad / Pye took over the brand and production when they purchased RCNZ in 1958, or Pye introduced the Astor brand in NZ around the same time as they purchased RCNZ and simply used those facilities to produce them (initially, at least).

9 Documented Astor Models
1957 Astor model 616 6  Dual Wave 
1958ish Astor model 525 5  Broadcast 
1959ish Astor model FEU 'Hobart' 5  Broadcast 
1960ish Astor model 230 5 + magic eye 5
1960ish Astor model M50 'Partygram' 3  Broadcast 
1960ish Astor model M53 'Transistaplayer' 4 transistors
1961ish Astor model JFU 5 4
1962ish Astor model PLK 5 4
1964 Astor model REU 4 + rectifier diode  Broadcast