This is the progression of world record improvements of the 400 metres M75 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate1:02.40Guido Müller22 December 1938Elsenfeld28 June 20141:03.12 Guido Müller22 December 1938Fürth2 March 20141:03.90 Robert Lida11 November 1936Bloomington16 March 20121:04.10Hugh Coogan15 August 1935Brisbane5 November 20111:05.34Wilhelm Selzer7 May 1927Potsdam21 August 20021:06.88Lucas Nel20 July 1923Gateshead7 August 19991:07.51Antonio Chaina1923Mar del Plata6 September 19981:08.24Fritz Assmy11 June 1915Budapest1 July 19901:08.5 Josiah Packard15 December 1903Santa Ana23 June 19791:09.9Herb AndersonGothenburg9 August 1977
References
Masters Athletics 400 m list