OLDWICK, N.J.--(BUSINESS WIRE)--AM Best has assigned a Long-Term Issue Credit Rating of "a-†(Excellent) to the recently issued $350 million, 5% 10-year senior unsecured notes due September 2035, issued by American Financial Group, Inc. (AFG) (Cincinnati, OH) [NYSE: AFG]. The outlook assigned to this Credit Rating (rating) is stable. The existing ratings of AFG and its subsidiaries are unchanged. AFG plans to use the net proceeds of the offering for general corporate purposes including share re. ...