Proof that Postal Money Orders required Bank Stamps in 1963 First you need to understand that Federal Reserve Bank requirements are set forth in "circulars" that are issued to member banks. My source for this fact is the Federal Reserve Banks' commercial website, specifically this page:  https://www.frbservices.org/regulations/operating_circulars.html . On that page it is stated: "Federal Reserve Financial Services are governed by the terms and conditions that are set forth in the f