Proof artwork is rare, normally only a handful were produced for approval. Some never made it past the drawing board making them very rare. In the digital age they hardly exist making proofs like this very sought after.
The award winning studio was resposible for producing some of the most iconic Album and single covers and associated promotional items for the 70s 80s and 90s. Part of that archive is now available to buy.
This artwork is part of that historic archive.