The set features expanded editions of all of the albums that Caravan recorded for Decca's Deram label in the first half of the 1970s.
A reel-to-reel tape featuring three unreleased songs expected to sell for more than £10,000.
Perhaps the best-known LP by the English outfit, the album is seen by many as their finest hour.
The film includes exclusive interview with Bowie associates including Tony Visconti and the last remaining Spider from Mars, Woody Woodmansey.
The collection includes highly sought-after weird & wonderful recordings from some of the great UK labels Decca, Polydor, Philips, Mercury, Deram and Fontana.
Yusuf/ Cat Stevens celebrates 50-year career with new album 'The Laughing Apple' released through Decca Records on 15 September 2017
In 1971, the new Cat Stevens sound was establishing itself, but an echo of his former self was to arrive in the US charts on 3 April.
Yusuf Islam has announced his A Cat's Attic tour, to feature “stripped-down, introspective” performances by the revered singer-songwriter.