[NickG0HIK]

Many thanks all for the responses.

So it is likely to have been a kit or made to a published design and the box was supplied by Mandaw.

I don't understand the terms of the Licencing Plate, does that mean it was built to a design from Marconi ?

The back of the front panel has a label which looks to be original and appears to say "106" on it, a part number? I don't think its 10'6.

The box is in good condition and no sign of worm, so I do think its worth a future project.

Although this isn't really my sort of thing, I do have some parts from this era and I'll print out the other Etherplus parts from the adverts and see what I can get together to build something of the period.