This map has certainly seen better days! The fact that the Hammersmith & City (salmon pink) line is not shown dates this map prior to 1990: the “peak hour only” dashed line on the very light purple Metropolitan Line, combined with the black text for station names leads me to believe that this is the 1985 map. By 1987, the Metropolitan Line had become a much darker colour, and station labels were the now-familiar blue.