In 1928 a new series of Federal Reserve notes were release that were 40% smaller than the previous series 1923. This series of notes included the first small sized high denomination notes. These high denominations were the 1928 $500, $1000, $5000 and $10000 dollar bills. This series included what is called the "Gold Clause" which read the following. "Redeemable in gold on demand at the United States Treasury or lawful money at any Federal Reserve Bank." These notes are often called gold certificates in error. Gold certificates have a gold colored seal. All districts issued star notes in this series and they are highly desirable.