November 2 (SeeNews) - The A.M. Best credit rating agency has upgraded the financial strength rating of “A–” to “A” (excellent) and the issuer credit rating of “a–” to “a” (excellent) of Slovenian insurer Zavarovalnica Triglav and its reinsurance unit Pozavarovalnica Triglav Re, Zavarovalnica Triglav said on Wednesday.