Resistance Is Futile: Weird Ex RAF Test Set Teardown 

Fantastic build quality.....thanks for showing this. It is very interesting. You are probably the first person to look inside since the 1960 Cal Date. The case looks great for very ruggedly housing a homemade valved TX/RX for /P working. A bit heavy for that though perhaps 🙂

The schematics look like a Kelvin Varley divider.

Interesting I have not seen anything like this before, It looks expensive, probably cost the MOD tens of thousands