Grand finalist one had had year 1979, a margin more smaller 30, and winner essendon?
Year Winners Grand Finalist Scores Venue Crowd Margin Season Result
List of Australian Football League pre-season and night series premiers
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Night series winners 1977–1987
Night series winners 1977–1987
1977 Hawthorn Carlton 14.11 (95) – 11.5 (71) Waverley Park 27,407 24 Preliminary Finalist
1978 Fitzroy North Melbourne 13.18 (96) – 2.8 (20) Waverley Park 26,420 76 9th
1979 Collingwood Hawthorn 12.8 (80) – 7.10 (52) Waverley Park 37,753 28 Grand Finalist
1980 North Melbourne Collingwood 8.9 (57) – 7.12 (54) Waverley Park 50,478 3 Elimination Finalist
1981 Essendon Carlton 9.11 (65) – 6.5 (41) Waverley Park 42,269 24 Elimination Finalist
1982 Sydney Swans North Melbourne 13.12 (90) – 8.10 (58) Waverley Park 20,028 32 7th
1983 Carlton Richmond 14.16 (100) – 10.6 (66) Waverley Park 32,927 34 Elimination Finalist
1984 Essendon Sydney Swans 13.11 (89) – 5.8 (38) Waverley Park 30,824 51 Premier
1985 Hawthorn Essendon 11.11 (77) – 10.8 (68) Waverley Park 24,812 9 Grand Finalist
1986 Hawthorn Carlton 9.12 (66) – 5.6 (36) Waverley Park 19,627 30 Premier
1987 Melbourne Essendon 8.10 (58) – 8.6 (54) Waverley Park 26,860 4 Preliminary Finalist
SELECT Grand Finalist FROM table WHERE Year > 1979 AND Margin < 30 AND Winners = essendon
1979 30 essendon