Sydney Newman's Rotary Phone

Origin
Sydney Cecil Newman, OC (April 1, 1917 – October 30, 1997) was a Canadian film and television producer, who played a pioneering role in British television drama from the late 1950s to the late 1960s. During his time in Britain in the 1950s and 60s, he worked first with the Associated British Corporation, or ABC (now Thames Television), before moving across to the BBC in 1962, holding the role of Head of Drama with both organisations. During this phase of his career, he was responsible for initiating two hugely popular television programmes, the spy-fi series The Avengers and the science-fiction series Doctor Who, as well as overseeing the production of groundbreaking social realist drama series such as Armchair Theatre and The Wednesday Play.

Effect
This phone was in the office of Sydney Newman between 1963 and 1967, during which he created Doctor Who. When a date is dialed on the phone (11-23-1963-02 for November 23, 1963 AD for example), and the receiver is picked up, the user will hear what their current location sounded like on that date and at the current time.