 OLDWICK, N.J.--BUSINESS WIRE-- insurance--AM Best has placed under review with positive implications the Financial Strength Rating of A- Excellent and the Long-Term Issuer Credit Ratings Long-Term ICR of a- Excellent of State Automobile Mutual Insurance Company SAM and its operating subsidiaries. Concurrently, AM Best has placed under review with positive implications the Long-Term ICR of bbb- Good of SAMs intermediate holding company, State Auto Financial Corporation STFC NASDAQ: STFC 