For modern bills, the Treasury Department seal is green and underneath the large word TWENTY on the right-hand side of the bill's face.
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.
$200 to $300 depending on condition.
The bill could be counterfeit, or if real, several hundred dollars.
Please post a new, separate question with the bill's date and seal color.
No US $20 bills were dated 1920. A brown seal most likely indicates you have a 1929 National Currency Note. If so, values depend on which bank distributed the bill. Please see the question "What is the value of a 1929 US 20 dollar bill?" for more information.
Please check your bill again. All 1950-series $20 bills were printed as Federal Reserve Notes with the familiar green seal color. The last red-seal $20 bills were dated 1914.
There are many varieties of US $20 bills that have brown seals, but only two types were printed in the 20th century - the 1929 series of National Currency Notes and the 1934 series of wartime currency printed for use in Hawaii.Please see the questionsWhat is the value of a 1934 US 20 dollar bill with HAWAII on it?What is the value of a 1929 US 20 dollar bill?
Please post a new, separate question with the bill's denomination.More information may be available at the following questions:"What is the value of a 1963 US 1 dollar bill?""What is the value of a 1963 US 5 dollar bill with a green seal?""What is the value of a 1963 US 10 dollar bill?""What is the value of a 1963 US 20 dollar bill?"
$20 Federal Reserve notes have been printed for over a century so more information is needed. Please check your bill again for the following:- Its date- What letter if any is next to the date- Its seal color if the bill is dated 1929, 1934 or any year before 1928Then look for questions like one of the following, depending on what you found."What is the value of a [date] US 20 dollar bill?""What is the value of a [date] [letter] US 20 dollar bill?""What is the value of a [date] US 20 dollar bill with a [color] seal?"and so on. Nearly every $20 bill printed since 1914 has been evaluated on this site.
If it has a blue seal, $20 if worn, $60 if only a bit of wear shows. If it has a green seal the corresponding prices are $12 and $20
Andrew Jackson is on the 20 dollar bill
No 1934-series $20 bills had red seals.If the seal color is brown and the word HAWAII is overprinted on both sides, your bill is a special issue printed during WWII for use in Hawaii under threat of invasion by the Japanese. Please see the question "What is the value of a 1934 US 20 dollar bill with HAWAII on it?" for more information.