Bowie was the band’s saxophonist, but drummer Hadfield decided the 16-year-old should sing lead vocals for the tape I Never Dreamed to give it ‘the right interpretation’.
Hadfield, who managed The Konrads, said: “David had no inclination to become a singer at this point, his heart and mind were focused on becoming a world-class saxophone player.
“Our agent, Eric Easton, who also managed the Rolling Stones, asked us to do a demo so he could try and get us an audition at Decca.”
In preparation for the demo with the record label, Hadfield said he booked the band into RG Jones’ small studio in Morden, south west London in 1963.
He said: “David and our guitarist Neville Wills wrote two to three songs.
“We had decided that we would do a couple of guitar instrumentals and one original song.”
Hadfield said he chose I Never Dream because it was the strongest of three songs and decided Bowie was the best person to sing it.
He added: “So this became the very first recording of David Jones singing 55 years ago.
“There is no other recording of the demo featuring David as lead in existence.”
Bowie quit The Konrads after the group were rejected by record company Decca, but his career took off six years later with Space Oddity.
The little piece of Bowie history was snapped up by an overseas collector an auction in Newton-le-Willows Merseyside, after it was estimated to sell at £10,000.
Promotional sketches drawn by Bowie when he was in band were also sold with photographs and band documents for a whopping £17,000.
Hadfield found the items tucked away in his garage loft, in a bread basket that belonged to his grandad, when he moved house in the nineties.
Omega Auctions director, Karen Fairweather, said there was a “bidding frenzy”.