Nice Diakon martial with adjustable receiver volume wheel.
This is a beautifaul example of a GPO 706L dated 1961. All plastic parts are made from Diakon material. This one has a rare to find reciever volume controle in the handset. I have totally stripped this telephone down and rebuilt it after each part has been cleaned and polished. It has been set up on a special line simulator to and tested on our own BT landline. I can make a dial label with your information at no extra charge.