There's a corrosion spot around the GRA on the obverse; it may have had bronze disease. I'd assume any cleaning may have been an attempt to remove or neutralize this corrosion.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Looks cleaned to me but it's a very common coin in any case - you could still pull them from circulation in England in this condition when we changed to decimals in 1971.
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