The bill should have a brown seal, indicating that it is a National Currency note. Despite its age, current values are only in the range $25.-$35. depending on how worn it is.
Please note that a bill's serial number doesn't normally affect its value or help to ID it. A serial number is just a counter, so you generally don't need to copy it to any questions you may have.
Federal Reserve Bank of Chicago Detroit Branch Building was created in 1927.
"G" is the Federal Reserve District letter rather than the series letter; if there is one it's next to the date. The fact that your bill is a Federal Reserve Note means it was printed in 1976 or later and is not rare. If you got it in change it's only worth face value.
The Federal Reserve is responsible for managing the money supply in the U.S.
The Federal Reserve was created in 1913
There are twelve Federal Reserve districts in the U.S.
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To clear things up, the bill wasn't made in Chicago. It was printed in Washington for distribution through the Chicago Federal Reserve District. Please see the question "What is the value of a 1934 A 10 dollar Federal Reserve Note?" for values and other information.
Federal Reserve Bank of Chicago Detroit Branch Building was created in 1927.
$130.-$175. depending on how worn it is.
There is no Federal Reserve Bank anymore, however it was previously located on the corner of Fort and Shelby.
Your bill is actually called a Federal Reserve Note, like modern $20 bills, rather than "a bank note of Chicago". Chicago is simply the Federal Reserve District location that distributed the bill. Please see the question "What is the value of a 1928 US 20 dollar Federal Reserve Note?" for more information.
"G" is the Federal Reserve District letter rather than the series letter; if there is one it's next to the date. The fact that your bill is a Federal Reserve Note means it was printed in 1976 or later and is not rare. If you got it in change it's only worth face value.
As of 04/2014, retail values are roughly $130 to $175 for bills in ciculated condition. An uncirculated one can bring $350 or more. All 1929 $100 National Currency bills are worth the same regardless of which Federal Reserve district distributed them. FWIW, the bills were actually printed in Washington at the request of the Chicago district.
Current retail prices for a bill that shows very little wear are in the $20 range.
The Federal Reserve has issued $100 bills for nearly a century, so a date is needed. Please post a new question with the bill's date and what letter if any is located next to or under the date. You don't need to copy the bill's serial number as that rarely affects a bill's value.
If worn, it might retail for about $30. In better condition that figure could go up to $200.
The Federal Reserve is responsible for managing the money supply in the U.S.