What is a misprinted 1977 $20 bill with double print on back uncirculated?

A misprinted 1977 $20 bill with a double print on the back, in uncirculated condition, may be considered valuable to collectors. The value of such a note would depend on the extent of the error and the overall condition of the bill itself. It is recommended to have it authenticated by a reputable currency grading service to determine its worth accurately.