No way to date the razor to an exact year and quarter. However, if you had the case and the case had a crown on it, that would have been from the 1953 Coronation of Queen Elizabeth.
If it has 'patent pending' on the inside of the blade tray, it's from the early 1950s to 1955 and if it has the British Patent details on the inside of the blade tray it's 1956 to when they finished the run of the 4th gen of British Aristocrats, 1960s sometime I believe.