Personal Number: 74552 Rank: Captain Name: James Mosley MAYNE Unit: Royal Artillery London Gazette : 28 January 1938 https://www.thegazette.co.uk/London/issue/34477/page/587/data.pdf The undermentioned Gentlemen Cadets, from the Royal Military Academy, to be 2nd Lts. 27th Jan. 1938: — ROYAL REGIMENT OF ARTILLERY. James Mosley MAYNE.
https://www.cwgc.org/find-records/find-war-dead/casualty-details/2603600/james-mosley-mayne/ CAPTAIN JAMES MOSLEY MAYNE Service Number: 74552 Regiment & Unit: 64 Field Regt., Royal Artillery Date of Death: 09 September 1943 Buried or commemorated at SALERNO WAR CEMETERY Grave Reference: III. B. 18. Location: Italy Additional Info: Son of General Sir Ashton Gerard Oswald Mosley Mayne, G.C.B., C.B.E., D.S.O., A.D.C., and of Lady Mayne (nee Tweddell), of Chelsea, London.
See also: https://www.findagrave.com/memorial/56576274 64 Field Regiment RA - Salerno Italy His father: 23034 General Ashton Gerard Oswald Mosley MAYNE, GCB, CBE, DSO, MiD*, Indian Army