Large Sized $20.00 Federal Reserve Bank Notes were issued for only one Series: 1918.

There is only one distinct variety (major differences with Series, Face Design, Seal Type and / or Back Design) within this denomination.

Series
1918

Series 1918
Face Design

Series 1918
Back Design

The Series 1918 $20.00 Federal Reserve Bank Notes represents the first Design Type of this class of notes. The Portrait on the left side of the face is

Series 1918 - Overprinted with a Small Blue Seal at right and Blue Numbers.