Big and heavy
The only thing I know about this meter I also got from Rene, is that it is really big and heavy. (28 x 20 x 8 cm) made from 2mm steel plate. It is well made. The switch is a very nice ceramic version and a treat to use. It measures AC and DC voltage and current.
The back without the steel plate.
It has a reset-able fuse. That is the small red pin left above the range switch. It looks like is was rack mount. The top connector is not electrical connected to the meter. It is probably only used for mounting. There is a little plate on the side that reads MG / VA ( probably German for Mess-Gerat Volt Ampere) DY1013.
The back plate mounted
The underside is open. We think it was made for educational use.
2020: I got mail from someone who recognised it. He was in training for Radio Holland between 1977 and 1979 and they used a big panel to build circuits by placing 15cm long “modules” that you could plugin the board that was equipped with clusters of bananas buses (for instance one with a resistor on it), a sort of Philips experiments kit in super-size. Not so strange because this system was made bij Philips.
This meter was part of this system.