Harry Truman actually said...
I hereby authorize and direct the Secretary of State to affix the Seal of the United States, pursuant to section 42 of title 4 of the United States Code, without any special warrant therefor, other than this order, to each document included within any of the following classes of documents when such document has been signed by the President and, in the case of any such document to which the counter-signature of the Secretary of State is required to be affixed, has been counter-signed by the said Secretary.
04/17/1952