25 March 1880: Massa Carrara Marble Company Limited, 53 King Street, London, v. Joseph Duff, Marble &c., Works, 66 York Street, Belfast

31 July 1914: Falmouth Visitors List: Pendennis Hotel: Major and Mrs Greatrex, Misses Ridley, Miss Pye, Mr and Mrs A. Eade, Mr and Mrs D. N. Duff, Mr and Mrs Kourouki, Mr and Mrs Nandeen, Mr and Mrs A. MacHilton, Mr and Mrs H. Lucas, Miss Hunt, Mr and Mrs F. I. Shaw, Mr and Mrs Joynt, sir Arthur and lady Martindale, Miss Martindale, Mr and Mrs Percy Godfrey, Mr and Mrs Hunt, Mr and Mrs Howard Burton, Miss Burton, Mr and Mrs T. B. Gabriel and party (5), Miss Stone and friend

30 August 1922: burial at Seaton Hirst: Margaret Duff, aged 60 years

November 1923: News of Old Girls: Marjorie Duff (1922) went to Penrhos College, Colwyn Bay