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<p>[QUOTE=&quot;Numbers, post: 1244648, member: 11668&quot;]The old O&#039;Donnell currency catalog talks about a plan to implement some sort of &quot;signature&quot; into the currency in order to allow for automated detection of counterfeits.&nbsp; Apparently it never happened, but in the late &#039;70s or early &#039;80s it was thought to be imminent.&nbsp; There&#039;s a specific mention of changing the seal color in order to distinguish the new notes from older ones lacking this &quot;signature&quot;.&nbsp; I&#039;m guessing that this cable refers to the same contemplated technology....[/QUOTE]</p><p><br /></p>

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