Common Contracts

December 7, 2004 Dan R. Carmichael President and Chief Executive Officer The Ohio Casualty Insurance Company Ohio Casualty of New Jersey, Inc. 9450 Seward Road Fairfield, OH 45014 Re: Letter Agreement Dear Mr. Carmichael:

Letter Agreement • January 14th, 2005 • National Atlantic Holdings Corp • Fire, marine & casualty insurance

• Contract Type
  Letter Agreement
• Filed
  January 14th, 2005
• Company
  National Atlantic Holdings Corp
• Industry
  Fire, marine & casualty insurance

Reference is hereby made to the letter agreement (the “Letter Agreement”), dated as of July 7, 2004, by and among National Atlantic Holdings Corporation (“NAHC”), Proformance Insurance Company (“Proformance”), The Ohio Casualty Insurance Company (“OCIC”) and Ohio Casualty of New Jersey, Inc. (“OCNJ”). Defined terms used herein shall have the meanings ascribed thereto in the Letter Agreement.

December 7, 2004 Dan R. Carmichael President and Chief Executive Officer The Ohio Casualty Insurance Company Ohio Casualty of New Jersey, Inc. 9450 Seward Road Fairfield, OH 45014 Re: Letter Agreement Dear Mr. Carmichael:

Letter Agreement • December 23rd, 2004 • National Atlantic Holdings Corp • Fire, marine & casualty insurance

• Contract Type
  Letter Agreement
• Filed
  December 23rd, 2004
• Company
  National Atlantic Holdings Corp
• Industry
  Fire, marine & casualty insurance

Reference is hereby made to the letter agreement (the “Letter Agreement”), dated as of July 7, 2004, by and among National Atlantic Holdings Corporation (“NAHC”), Proformance Insurance Company (“Proformance”), The Ohio Casualty Insurance Company (“OCIC”) and Ohio Casualty of New Jersey, Inc. (“OCNJ”). Defined terms used herein shall have the meanings ascribed thereto in the Letter Agreement.