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<p>[QUOTE=&quot;messydesk, post: 8298710, member: 1765&quot;]I&#039;m not aware of any deliberate detail added for the purpose of preventing counterfeiting.&nbsp; The level of detail of the designs, process of die manufacturing, and the need for precious metals in the right weights went a long way to prevent counterfeiting.&nbsp; Fake banknotes had a higher payoff and may have been lower hanging fruit.&nbsp; For circulating coinage, any secret mark would have to be pronounced and protected enough to survive circulation wear.</p><p><br /></p><p>Today&#039;s die manufacturing processes allow using steganography to encode an authentication message in the seemingly random 60-grit cameo surfaces.&nbsp; To authenticate such a coin, you&#039;d need to read the surface texture and decode it with a key.&nbsp; The stronger the encoded image, the easier it would be to read (i.e., adequately photograph for authentication), but it would also be more easily reproduced.&nbsp; </p><p><br /></p><p>Going a step farther, such an image could be applied directly to the coin and encode a serial number, which would also be human-readable on the coin.&nbsp; This would operate much as PCGS&#039;s RFID chips in their slabs do.&nbsp; Something capable of reading and decoding the latent encoded image would tell you what coin you should be looking at.[/QUOTE]</p><p><br /></p>

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