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This is my best. Weak

At least 4 weeks in olive oil, changing the oil after 2 weeks I would say. That should get rid of a decent amount of the verd on the reverse. Can't do much, if any, harm in my opinion.

Unfortunately acetone will have no effect on inorganic salts such as verdigris. And I wouldnt be in a rush to turn to the olive oil either (though as a mild organic acid it may be helpful if all else fails). I would initially de-grease the coin of those waxy handling deposits by scrubbing fairly aggressively in petrol using something like a small paint brush cut short. It shouldnt abrade the patina, or alter the colour. Then wash in acetone. What you will be left with is the stubborn verdigris, and here I do like verdicare, though it takes time as the verd has to be manually 'picked' at periodically. I use a 20 to 40 X binocular microscope, which helps a lot. I would have thought that this coin could be 'saved'. The bottom line is that you might have to strip the coin using a weak acid, and re-tone it. There may well be some minor pitting if the verd has removed much metal. Jerry

I have one on sale which I am confident is GVF or better , others may disagree of course!

U bought this quality halfpenny scott ? not like your usual buttons at all.