Interesting Question.
Surely More Than One Copy Would Have Been Originally Made In Error, But Kept From Sale (Quality Control)
Seem To Remember Some Records Rescued From Various Disposal Methods In The 60's.
Would Have Thought Quite Rare, However, Not Every Collector Would View This As Desirable,
So Rarity May Not Increase Value, Possibly The Opposite.
-------------------------------------------------------------------
Personally, I Am Intrigued By Pressing Plant Variations Like This One.
I've Often Wondered How Much Freedom An Employee Would Have.
Could It Be A One Off By Someone At The Plant, Swapping The Top Label Of A Batch For Instance.