It does not exist.
The earliest known confirmned recording comes from 1972:
Queen: Unreleased, Live, Marquee, London, 20 December 1972
Richard Thomson: original mono reel-to-reel. (Earliest known bootleg – but dreadful quality copies).
Christie’s Pop And Guitars Auction, Thursday 6th June 1996.
Richard Thomson: Lot 154 sold £2,800
Bought by Queen Productions Ltd – Andy Davis, Record Collector, 11th June 1996.
Set similar to 10th March 1992, except, Night Comes Down, See What A Fool I’ve Been, Stone Cold Crazy, and Hangman dropped from the set. New material includes Doing Alright, and Ogre Battle.
Great King Rat, Son & Daughter, Jesus, Doing Alright, Ogre Battle, Keep Yourself Alive, Liar, Jailhouse Rock, Bama Lama Lama Loo
(Oddly enough Richard Thompson does not retain a copy).
The most common earliest gig would be from 1973:
Queen: Unreleased, BBC Radio Session, Live Golders Green Hippodrome, 13 September 1973
BBC Pop Spectacular Transcription Services 135600 – S
Rogues And Scoundrels Bootleg LP
Saturday Night’s All Right For Fighting Bootleg CD
Cry Argentina Bootleg CD
In Concert BBC Radio One
Broadcast 13th Sept 1973
Produced by Jeff Griffin
Sound balance by John Etchells
Leaping about Paul Deley.
Available as BBC Pop Spectacular Transcription Services LP 135600 – S.
(Rock ‘n Roll Medley cut from broadcast, LP transcription and bootleg discs).
Procession, Father To Son, Son & Daughter, See What A Fool I've Been, Ogre Battle, Liar, Jailhouse Rock, Stupid Cupid, Bebop a Lula, Big Spender, Bama Lama Lama Loo
Finally;
It was long believed that the earliest bootleg came from 1971,
Queen: Unreleased, Live, Ewell Technical College, London, 9 January 1971
Freddie Bulsara: Vocals
Brian May: Guitar
Roger Meddows Taylor: Drums
Barry Mitchell: Bass
Supporting Kevin Ayers And The Whole World Band, Flying Fortress and Genesis.
Ken Testi recorded the entire set on a Grundig tape recorder, but only the Rock and Roll Medley remains.
A flyer for this concert is briefly viewed in the official “Genesis - Archive” video
Keep Yourself Alive, Doing Alright, Liar, Great King Rat, Modern Times Rock and Roll, Son and Daughter, Hangman
Rock and Roll Medley: Jailhouse Rock, Stupid Cupid, Bebopa Lula, Big Spender, Bama Lama Lama Loo
However, this has been shown by Queenzone 'viewers', that this concert description was not accurate. Although the memories of those involved believed it was from 1971, in truth, it turned out to be another version of the Golder's Green gig by mistake.
As suggested, early (known) gigs are very rare, and I doubt if any exist in any real quality. If they do, they would certainly be in the private collections of either Brian May or John Deacon, and for some strange reason - I can not see them publicaly sharing on this forum!