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<p>[QUOTE=&quot;Info Sponge, post: 692248, member: 20538&quot;]Google has been of limited help.</p><p><br /></p><p>How they are made is my first question. The only information in Googlespace seems to be that some have the hologram printed in a resin layer over the real coin, and some have it in the metal. How do you get a fine interference pattern stamped onto the coin? Or is it not part of the die, but etched on afterward? Is the process high technology, or just vanilla?</p><p><br /></p><p>How good are they? Are the holograms as lame as the one on my Visa card, or do they give a full 3-D effect?</p><p><br /></p><p>What do collectors think of them? They don&#039;t seem to have much mindshare. Are they considered a vulgar gimmick to be despised (like colorized coins), an interesting but obscure niche, or just not thought about at all?</p><p><br /></p><p>The answer I&#039;m hoping for most is to be told there&#039;s a good book covering the subject. That&#039;s better than taking up everybody&#039;s time here. But seeing what people think in a discussion would be fun too.[/QUOTE]</p><p><br /></p>

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