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In the UK, the phone labelled as 1950s didn't come into use until the 1960s. There was a phone a little more modern than the 1940s one shown here but very similar in style which was widely used in the 1950s. I used one to learn to use the telephone when I was 4 years old. I still remember the 4 digit phone number and I remember a trip round the new telephone exchange in the early 1960s which was entirely electromechanical using vast banks of uniselectors and consequently very noisy. When I took my degree in electronics my final year project was the design and construction of the control electronics for a reed relay based telephone exchange; reed relays were more reliable than relays open to the air as the contacts were in a sealed glass tube filled with an inert gas. Can anyone guess my age from the above?