The $1 One Dollar Bill Double Gas Pump Error Odometer Note (6&4) Fancy Serial Number is a unique and collectible piece of paper money from the United States. With a marked error in the serial number, this circulated bill from 2021 features a fancy serial number that sets it apart from other $1 bills. This special note would be a valuable addition to any collection of US currency, especially for those interested in error notes and unique serial numbers.