Electronic Stethoscope, anyone know about this?

[Sihaventaclue]

Hi, I trade and restore old hand tools, every now and then something turns up in a lot of tools that leaves me scratching my head. It’s a wooden green box with earphones, cable reel, some magnetic bits and other parts that I do not understand. If anyone can enlighten me I’d be grateful.

[Guards Armoured]

I have just googled the NSN on the box and this came up:

https://de-de.facebook.com/RAFLECONFIELD/
If you scroll down you will find a picture of the stethoscope being demonstrated.

Robert

[Sihaventaclue]

That’s amazing, thank you!  I shall delve deeper at the weekend!