"Sometimes we find something new that we were not looking for," the Wisconsin Historical Society said about the discovery.

Reverse Text: TWENTY DOLLARS / US / XX / 20 / UNITED STATES OF AMERICA. / PRINTED AT THE BUREAU OF ENGRAVING & PRINTING / WASHINGTON D.C. / THIS NOTE IS A LEGAL TENDER AT ITS FACE VALUE FOR ALL DEBTS ...

/ UNITED STATES OF AMERICA. / $1000. / M / ENGRAVED & PRINTED AT THE BUREAU, ENGRAVING & PRINTING / THIS NOTE IS A LEGAL TENDER AT ITS FACE VALUE FOR ALL DEBTS PUBLIC AND PRIVATE, EXCEPT DUTIES ON ...