ID: 
2554
Maker's Name: 
Airzone (1931) Ltd, Sydney
Where made: 
Australia
1942
Dimensions: 
19 × 11 × 10.2 cm

Essentially a DC motor and generator sharing a common shaft and static magnetic field.

Input 11V, 3.2 A

Output 354 V, 0.04 A

The conversion efficiency was about 40 %.

Probably used to provide a high voltage supply fot the anodes of  valves in battery powered transmitters.