Districts are identified by letters and/or numbers depending upon where they're referenced. The districts are:
It depends on what letter, if any, is next to the date. A 1928 C bill from the Cleveland* Federal Reserve District is quite valuable, with prices for a circulated bill in the $250 to $450 range as of 10/2011. Other letters are much more common; please see the Related Question for more. (*) To explain, there's no "Federal Reserve of Ohio". It's actually the Fourth Federal Reserve District which has its offices in Cleveland, so it's generally referred to as the Cleveland Federal Reserve District.
There were no series letters on any 1929 US bills. You may be referring instead to the Federal Reserve District letter; "G" indicates your bill was distributed by the Chicago district. There's more information at the question "What is the value of a 1929 US 100 dollar Federal Reserve Note?"
"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 green seal indicates that your bill is a Federal Reserve Note. Check to see if there's a small letter next to the date, and look for the name of the Federal Reserve District inside the seal with a large capital letter. Approximate values as of 01/2012 are: No letter, Richmond District: $40 to $65 in average condition, $100 or more uncirculated. No letter, any other district: $22 to $45 / $70 "A", Kansas City District: $45 to $95 / $275 "A", any other district: $22 to $45 / $70 "B", Atlanta District: $4 to $65 / $175 "B", any other district: $22 to $45 / $70 "C", Chicago District: $175 to $500 / $1800 "C", San Francisco District: $350 to $1000 / $3500
Regardless of the district or series letter, values as of 09/2012 are $65-$95 in circulated condition and $350 or more uncirculated.
The large letter in the center of the deal indicates the Federal Reserve District.
"A" is the highest series letter for 1928 $50 Federal Reserve Notes. "K" is most likely the Federal Reserve District letter. The series letter, if any, on US bills is next to the date. Please see the question "What is the value of a 1928 US 50 dollar Federal Reserve Note?" for more information on values.
It depends on what letter, if any, is next to the date. A 1928 C bill from the Cleveland* Federal Reserve District is quite valuable, with prices for a circulated bill in the $250 to $450 range as of 10/2011. Other letters are much more common; please see the Related Question for more. (*) To explain, there's no "Federal Reserve of Ohio". It's actually the Fourth Federal Reserve District which has its offices in Cleveland, so it's generally referred to as the Cleveland Federal Reserve District.
On modern large-portrait bills, the second letter of the serial number indicates the issuing Federal Reserve District. E.g. AB12345678C would indicate a bill printed for the New York district ("B") Current $1 and $2 bills and all older bills had only a single leading letter which designated the district. In addition the district was identified by a special seal showing the district letter, and each corner of the bill had the district's corresponding number.
It's inside the Federal Reserve Seal, located on the left side of the bill's front, very much like the seal on a $1 bill. The issuing district is shown in small type surrounding the large district ID letter. The term "issuing district" does NOT mean where the bill was printed, simply which Federal Reserve District requested and distributed it. All 1976 $2 bills (in fact, all US bills up till 1991) were printed at the Bureau of Engraving and Printing in Washington.
There were no series letters on any 1929 US bills. You may be referring instead to the Federal Reserve District letter; "G" indicates your bill was distributed by the Chicago district. There's more information at the question "What is the value of a 1929 US 100 dollar Federal Reserve Note?"
The Federal Reserve District letter identifies which of the 12 districts distributed the bill. Many people assume that the bills are actually printed in that district, but in fact all US bills are printed at facilities of the Bureau of Engraving and Printing in either Washington or Fort Worth. The BEP takes orders from each Federal Reserve district, prints bills with that district's seal, and sends them back to the district's central banking repository for distribution through commercial banks. The district letter is shown inside the seal on $1 and $2 bills. Higher-denomination bills no longer have the district letter in the seal, but instead it's incorporated as part of the bill's serial number.
The 1934 series only extends to the letter D. You may be confusing the series letter with Federal Reserve Bank letter, which is "E" for the Richmond Federal Reserve District.There's more information at the Related Question.Note that the bill was actually printed in Washington; the Richmond district ordered it and distributed it.
"D" is the highest series letter for a 1934 $10 FRN. The series letter is next to the date. A "J" would most likely be a Federal Reserve District letter. Please see the Related Question for more information.
The Federal Reserve District letter identifies which of the 12 districts distributed the bill. Many people assume that the bills are actually printed in that district, but in fact all US bills are printed at facilities of the Bureau of Engraving and Printing in either Washington or Fort Worth. The BEP takes orders from each Federal Reserve district, prints bills with that district's seal, and sends them back to the district's central banking repository for distribution through commercial banks. The district letter is shown inside the seal on $1 and $2 bills. Higher-denomination bills no longer have the district letter in the seal, but instead it's incorporated as part of the bill's serial number.
Bills from the Kansas City Federal Reserve Bank will have the letter J and the number 10 on them.
Modern US $1 and $2 bills still carry the old-style Federal Reserve seal that includes the district letter and name. It's the large circle on the left side of the bill's front.However older $1 bills (before 1963) and $2 bills (before 1976) weren't issued by the Federal Reserve System so they don't have any seal or district identifiers.