What is the value of a one dollar bill with no serial number?
Bills are printed in multiple passes, and occasionally a sheet is accidentally left out of one or more steps, or is put into the press wrong-side up. Check both sides of your bill. If the serial number is on the back side, it’s an inversion error and could retail for over $300. If it’s missing the serial number entirely, I can’t find a valuation for that error – you’d need to have it appraised by someone who specializes in error currency.