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Hello. My name is Robert, and I have a very unique twenty-dollar bill. It is a 2013 series, and on the left side of Jackson’s head, there is the number 500 running down towards his temple. It looks like it was printed by mistake, and I have never seen another bill like it. The serial number on it is MJ43100399C. There is also the mark of J10 just below the serial number on the upper left-hand side in the front. The 500 on Jackson’s head is clearly visible on the backside when held up to the light, and it is obvious that it was printed onto the bill. If you are interested in the bill, I can be reached at *************. Thank you.
Sorry for the late reply! That sounds like a really unique printing error on your 2013 $20 bill, especially with the “500” on Jackson’s head and the J10 mark. Errors like this can be valuable depending on condition and collector interest. For your safety, please don’t share your phone number publicly online. If you want, you can send detailed photos to a trusted currency expert or check resources like varietyerrors.com for more info. Thanks for sharing!