Stores ref. 5C/455, 10H/2717  Two pin plugs and panel /bulkhead sockets used on RAF/ RAE (Royal Aircraft Establishment) electrically wired flying clothing. The plugs are Air Ministry King's crown marked.  This type of plug can be seen on the RAE 'Irvin' gloves and ankle boots, RAF 1941 pattern Sidcot suits etc.  Sold as a pair, plug and socket - PHOTO SHOWS THE FRONT AND REAR VIEW OF A PAIR