EXTREMELY RARE MISPRINT Elizabeth II D.G. Regina obverse + George IV reverse

Selling my grandpa's old coins. More will be listed later. This one seems to be EXTREMELY rare. I couldn't find ANY prints where Elizabeth was on the front and the stag was on the back. From what I found The stag is supposed to be on the back of a George VI coin, meaning there was some sort of misprint on the back where instead of being the standard shield with the lion on the left and the unicorn on the right, she got printed with the George VI back. I was obviously INSANELY confused trying to research this one lol. There also seems to be a misprint where it says 1084 not 1984. I thought maybe the blue mark was warping it, but comparing it to other variants of the same coin, it's still not the correct shape for a 9. The left curve comes down too low, so something must have happened during printing where the 9 on the stamp got bent or skewed.

Open to offers and negations or discounted buy one get one 50% off bundling with other coins or items over $200 on my shop. Shoot me a dm!