Could be a printing error or a counterfeit. Printing errors are collectable. A dealer or a collector could look at it for you and probably tell you more about it.
CorrectionThe motto was first added to $20 bills starting in 1963 so it's perfectly normal if a 1934-series bill doesn't have it.Around $40 but if you put it up on Ebay and get lucky you could get up to $100.
1934 is the only series date from the 1930s. Please see the Related Question for more information.
What is the vale of 500 dollar from 1934 kas city
The motto In God We Trust didn't appear on US $10 bills until 1963 so it's not a mistake on a 1934-series bill. There's more information at the Related Question.
L is the Federal Reserve district letter. The series letter is next to the date, and will either be not present, or an A.
This is a Federal Reserve note and should have a green seal. They are worth $22-$30 in circulated condition and $40 or more in uncirculated condition.
If you mean the series date, it's 1934
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The 1934 100-dollar bills ended with Series D. A note in good condition, with little wear can be worth about $140.
a hundred dollars.
The U.S. did not issue silver certificates with that denomination in 1934. For values of 1934 Federal Reserve Notes visit: http://www.uscurrencyauctions.com/$20notes.htm
The highest series letter for 1934 $20 bills was D. You may be looking at the Federal Reserve District letter rather than the series letter - the series letter is by the date. Please see the question "What is the value of a 1934 US 20 dollar bill?"