An original abstract picture entitled 'Walls 1' by Peter Bain signed and dated 1973 with Artist's Proof in the bottom left corner, framed in an an aluminium Fram typical of the era. I have been unable to find any other works similar to this but the search continues...

The dimensions are:

Height: 790mm
Width: 435mm
Depth: 15mm

Original Artist's Proof 'Walls 1" by Peter Bain, 1973, Signed by Artist, Framed