Скачать или смотреть Caedmon: 'RARE the Title Track'

The 2019 song explores the making of a ceramic grail, its duplication and collectability.
Caedmon's 1978 eponymous album was released on vinyl by the band. 500 copies were made and sold at their Farewell Concert in Edinburgh.
In the '90s it was 'discovered' and was rereleased as a CD, with a 3 year licence, by Kissing Spell.
There have been many unlicensed releases made as well.
The band never intended to make money from the album, received a small renumeration when it was licensed. But as an asset shared by collectors the 500 albums are now worth ~half a million pounds. It's referred to as a collectors' 'GRAIL'.
What makes RARENESS?