Definitely. This error can be worth over $100 depending on the bill's condition.
A mismatched serial number occurs when one of the two counters that prints the numbers gets stuck.
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Depending on the nature of the error, it could be worth $200 to $500 at retail. Missing serial numbers can occur if the bill wasn't fed through the part of the printing process that adds the seal and serial numbers, or if it was fed in upside down and the seal and serial numbers were printed on the back. In any case it should be seen by a dealer or appraiser who specializes in error currency.
The serial numbers on the back of a watch are there for the customer to know that the watch is real. The serial numbers can be looked up at the retailers.
They're simply sequential numbers printed on the bills by a device that looks a bit like an old-fashioned mechanical odometer in a car. Every bill that's printed clicks the counter up by one digit. Except for "unusual" numbers (e.g. 00000005, 33333333, 12345678, etc.) the serial number on a bill does not affect its value.
Most do not (they have green serial numbers). Usually its to prevent counterfeiting by using an ink that previously counterfeiters didn't have. All sorts of ink was used in the "large sized" series of US notes, but in the small sized, a general rule of thumb is: Brown serial number - National Bank note Blue serial number - Silver Certificate Red serial number - United States Note Yellow serial number - Gold certificate Green serial number - Federal Reserve Note However, these guidelines may not always be the case, especially as it relates to older (pre-1928) currency