I think the point is, this is a bogus 'promissory note' issued after the 1933 Government Bankruptcy and resulting Emergency Banking Act, which made private gold ownership 'illegal' for private citizens. The banksters fleeced Americans of their gold for a set price of $35/oz.

“It is an established fact that the United States Federal Government has been dissolved by the Emergency Banking Act, March 9, 1933, 48 stat. 1, Public Law 89-719; declared by President Roosevelt, being bankrupt and insolvent. House Joint Resolution 192, 73rd Congressional session June 5, 1933 –– Joint Resolution To Suspend The Gold Standard and Abrogate The Gold Clause dissolved the Sovereign Authority of the United States and the official capacities of all United States Governmental Offices, Officers, and Departments and is further evidence that the United States Federal Government exists today in name only”
United States Congressional Record, March 17, 1933 Vol. 33