As Carl 'should' know, the Plate Block stamps are the most valuable ones. The one shown on the Halli Web Site is the Plate Block stamp with authentication numbers/codes. Not just "a stamp ". Duane Fischer, W8DBF - WPE8CXO E-Mail: dfischer at usol.com Hallicrafters web site: www.w9wze.net HHRP web site: hhrp.w9wze.net