There are more than half a dozen varieties of this bill, so more information is needed. Please post a new question with the following information:
> What letter, if any, is next to the date. If there is one it'll be A, B, or C.
> The name of the Federal Reserve district that distributed the bill; for ex. Chicago, Kansas City, etc.
Alternately, check the related link below for a price guide.
The green seal indicates that your bill is a Federal Reserve Note. All 1928 B $20 bills were printed as FRNs. Please see the question "What is the value of a 1928 B US 20 dollar bill?" for more information.
About $5 retail.
The green seal indicates that your bill is a Federal Reserve Note. Please see "What is the value of a 1928 D US 5 dollar Federal Reserve note?" for more information.
Please check your bill again and post a new, separate question. The last red-seal $20 bills were dated 1914. The 1928 series was printed with gold seals (gold certificates) and green seals (Federal Reserve Notes).
The green seal indicates that it's a Federal Reserve Note. Please see the question "What is the value of a 1928 US 5 dollar Federal Reserve Note?" for more information.
Please check your bill again and post a new, separate question with its denomination.
A 1928 $2 bill, series D is only worth about $38 today. This varies depending on who you are selling to and what condition it is in.
The green seal indicates that your bill is a Federal Reserve Note. All 1928 B $20 bills were printed as FRNs. Please see the question "What is the value of a 1928 B US 20 dollar bill?" for more information.
the serial number does not match the series
About $5 retail.
The green seal indicates that your bill is a Federal Reserve Note. Please see "What is the value of a 1928 D US 5 dollar Federal Reserve note?" for more information.
A 1928 $2 bill, series D is only worth about $38 today. This varies depending on who you are selling to and what condition it is in.
"F" is the highest series letter for 1928 $5 red-seal notes. Please check your bill again and see the question "What is the value of a 1928 US 5 dollar bill with a red seal?" for more information.
Please check your bill again and post a new, separate question. "G" is the highest series letter for 1928 US $2 bills.
"D" : $5 - $12; UN-circulated $45+
Please check your bill again. There were no series letters on 1928 $1 United States Notes. The only 1928 G bills were $2 US Notes.
Please check your bill again and post a new, separate question. The last red-seal $20 bills were dated 1914. The 1928 series was printed with gold seals (gold certificates) and green seals (Federal Reserve Notes).