Thirty Thursday: 1914 $20 / $10 Double Denomination Fr. 988

What is the face value of a double denomination note like the one above. I say it is twenty dollars because of the statement on the obverse that says "THE UNITED STATES OF AMERICA WILL PAY TO THE BEARER ON DEMAND TWENTY DOLLARS." The reverse does not have a similar statement. If there were a double denomination like above but with the ten on the obverse and the twenty on the reverse then I say the face value would be ten dollars because of the statement on the observe that would say "THE UNITED STATES OF AMERICA WILL PAY TO THE BEARER ON DEMAND TEN DOLLARS" with no similar statement on the reverse.

But what about contemporary double denomination Federal Reserve Notes, if any? There is no statement on either side obligating anyone to do anything.

Of course it's irrelevant. That's what makes it a fun question. Maybe the answer lies elsewhere. A Federal Reserve Note is just a piece of paper when it is first printed. It only becomes an obligation of the United States and the Federal Reserve system when it is issued by a Federal Reserve Bank. What did the Federal Reserve Bank of Chicago intend for the denomination of this note to be? How was the issuance of this note recorded on the accounting records of the Federal Reserve Bank of Chicago?