subcontractor to <#sennett=Sennett Security Products> for <#stamp> printing.   Example: <#scott=Scott> 3052, the 1999 33¢ Rose stamp.

the home of the <#aps=American Philatelic Society> and the <#aprl=American Philatelic Research Library> in Bellefonte, Pennsylvania.

service of the <#aps=APS> that renders authoritative opinions on the genuineness of stamps and covers.