August 11, 1997
The U.S. Office of Personnel Management, with the concurrence of the Office of Government Ethics (OGE), is adopting as final an interim rule published July 16, 1996, issuing a final rule which supplements, for OPM employees, the executive branch-wide Standards of Ethical Conduct (Standards) issued by OGE.
https://www.govinfo.gov/content/pkg/FR-1997-08-11/pdf/97-21047.pdf