1970 Painting by Bjorn Wiinblad

i was very excited to find this large painting / silkscreen by Bjorn Wiinblad in 1970. it's done in all gold paint and is pretty large - signed and dated. It's 26 inches square and appears to never have been removed from the original frame. the background seems to be discolored - maybe from sunlight? i have no idea how common/uncommon these are, but i've kind of always known that sooner or later, i would find a piece of work by him. i've really liked his work for a long time. any info appreciated!