Vintage S.G Brown type F earphones

A recent car boot find that I simply couldn't pass up, I've very little interest in electrical items but these were just too good to leave on the stall, especially at £4!


I've no idea if they still work as I've nothing in the house that takes a large 'jack plug',they are however immaculate and appear never used?

They date from the mid 1920's onwards and are I believe 2000 Ohms.

Obviously they were worn by a Lancaster bomber crew-member involved in the 'Dam Busters' raid, at least that's how the guy on the stall sold them to me!

Here's a couple of links for more information. 

  

 http://www.richardsradios.co.uk/sgbrown.html 

   http://www.radiomuseum.org/r/brown_headphones.html