This object is a 'spy radio'. It was a type that was widely used by Allied secret agents operating in German-occupied Europe during the Second World War.
The agent could use the radio to communicate with their controllers back in the UK, for example to send information about enemy troop movements or defences.
It was hidden in what looked like a normal leather suitcase, to conceal its purpose from enemy soldiers and police. Its official name was a "Transmitter/Receiver Type 3 Mark 2".
Some special uniform buttons had a tiny compass built into them to help escape capture by the enemy.
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