article_snippet: A. Mack Pogue and A. Mack Pogue son, D. Brent, it is considered the most .
article_snippet: $4.5 million, the nonprofit Professional Numismatists Guild .
article_snippet: Walter Husak, a retired aerospace entrepreneur based in .
article_snippet: Barry Stuppler, secretary of the Professional Numismatists .
article_snippet: The Pogue Collection is extraordinary.'