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<p>[QUOTE=&quot;Hookman, post: 8292548, member: 99642&quot;]I&#039;m not familiar with coins having secret marks on them, however, all American currency(I&#039;m not sure about foreign currency) does have somewhat secret marks and/or micro printing on it as a detection for, and a deterrence to, counterfeiting of currency.</p><p>I say &quot;somewhat secret&quot; because our government itself advertises this micro-printing as a way to help retailers prevent themselves from receiving phony money.</p><p><br /></p><p>As a sidenote, but still in the subject matter of &#039;secret marks&#039;, especially if on government issued documents, back in 1972 and 1973, I was a draftsperson (do you see what I did there to stay PC?) with the U.S. Army Corps of Engineers. I drew up examples of Jetty Condition Surveys. On many of those drawings I added marks that changed the letter O and the number 0 into Peace Signs. Because the drawings started as 24&quot; by 36&quot; mylar sheets, which were greatly reduced in size before copying and printing, my &#039;artwork&#039; was able to go unnoticed, except by those &quot;in the know&quot;.[/QUOTE]</p><p><br /></p>

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