Okay, so I am trying to discover the mark under the chin of the queen. Is it an error in the stippling, a special mark as this was the last year, or something I am not thinking about? What ideas can we chat about?
I'd suspect the area under the chin is most likely a spot of grease struck through. But I'm also concerned by the extensive cloudiness behind her head, below the bust, and in front of her nose, as well as the spotting on her neck. I've never seen so many problems on a Royal Mint coin. Are you sure this is genuine? The picture is too blurry to comment on finer details.