USA (Washington, D.C.), $10, series 1981, serial E73057063A, Buchanan-Regan, overprint on back error, PMG XF 40. Fr-2025-E. A dramatic error note with the serial numbers, Federal Reserve District seal and number, and Treasury seal printed on the back. Frankly, it's a wonder this circulated at all given how clear the error is yet, somehow, it did with light folds and handling noted yet still retaining bold embossing throughout.
($150-225)