Hoax alert! Inserted amongst the legitimate album covers from my collection was this 'matching set' of front & back covers from the Deep Purple In Rock album. I was waiting for someone to spot the deception, but no one seems to have caught it. The astute among our esteemed TD members might have noticed that there are only 4 'backsides' when there are 5 heads in the front cover photo. Someone more clever than I came up with that gag back cover and posted it to the internet. I photoshopped it a bit to make it better match the front cover.
Here's the real 'backside' of the album from the Japanese re-issue in my collection. It's the same photo as the one on the front cover.
including the rarely seen backside of the album