This is the progression of world record improvements of the 400 metres M40 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate47.82Enrico Saraceni19.05.1964Arhus25.07.200447.86Eric Roeske26.09.1960Potsdam21.08.200247.87Manuel Ulacio1940Santiago11.04.198149.57Bruno Bianchi08.01.1939Hannover01.07.197949.5 Noel Clough25.04.1937Gothenburg08.08.197749.7 John Dixon15.03.1932Crystal Palace, London22.06.1973
References
Masters Athletics 400 m list