Here are all of the clips I’ve been able to find thus far of significant pre-War or Wartime football. There are others – I’ve favoured clips that give at least a faint idea of play or an idea of the sort of people involved. If anyone can locate the 1912 West Ham v Manchester United clip that Youtube have deleted, I’d be delighted to see it.
Arsenal 1897 (Football in Hades: it doesn’t make it look like fun)
Blackburn v West Brom 1898 (Not much going on here, either)
FA Cup Final 1901 (Mark Holland of Blognor Regis’ ancestor visible here)
FA Cup Semis and Final 1930 Part One
FA Cup Semis and Final 1930 Part Two
Herbert Chapman with the Arsenal team (I was excited to find this – on British Pathe originally – but only for a moment or two, as you’ll see.)
George Allison, Chapman’s successor
Arsenal v the British Land Army 1945
Please link to any more (legal) ones you may have in the comments.