AEG Wattmeter Dynamometer instrument 0 to 1200 Watts 240 Volts 5 Amps AC/DC. Working, German, date unknown.
This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt
Interior of the instrument
How much is it worth? Instruments such as this are of little use today and not many people seem interested in them. Expect to pay £5