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Looks like a full Face-to-Back offset transfer error. If it’s not already, get it into a currency sleeve. If you don’t have one, message me and I’ll send you one. Are you able to post a photo of the other side ?
Many would submit the note for authentication and grading. It definitely meets the monetary threshold for me. It would make it much easier to market the note in the future for either you or one of your heirs. The grading company typically lists the name of the error on the holder. Makes it super-safe.
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