OREANDA-NEWS. A.M. Best has assigned an issue rating of “a-” to the recently announced $300 million 3.5% 10-year senior unsecured notes of American Financial Group, Inc. (AFG) (Cincinnati, OH) (NYSE: AFG). The assigned outlook is stable. AFG’s issuer credit rating of “a-”, its existing issue ratings and the ratings of its operating insurance subsidiaries are unchanged.