This is a great example of a GPO 150 candlestick telephone dated 1924 and fitted with a pulse to tone unit. Originally a No2 but GPO converted to a No150 in the early 1930s. This telephone will work on any telephone network. Fitted to a GPO No1 size bell set originally manufactured in 1924. This is a plug in go item. Simply screw the bell set on the wall and plug into your telephone socket and away you go.