In their catalogue it was named the "Model B Crystal Set" and according to the online Radiomuseum site the model dates from 1923. Being a British set of that time, it has the BBC logo and the notice that it is approved by the Postmaster General, permit number 615.
Opening the lid, inside are all the controls and terminals. It is mostly complete; one of the studs for a switch is missing, but the twin detectors are there. Also all the terminal screws are present and correct. A shorting plug for the connectors for an extra tuning-coil would've been nice, but that'd be asking too much. Everything is a bit dusty and dirty, but this should clean up fine.
One of the detector glass cover tubes was replaced by a length of measuring cylinder. The rear glass is original from the early 1920-ies, with a section whitened for better visibility of the whisker.
When new this must've been exciting new technology, but this crystal radio has been obsolete technology for a very long time.
A neat project to slowly bring back into shape and make function again.