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<p>[QUOTE=&quot;The_Cave_Troll, post: 141328, member: 1674&quot;]idk, it may be that your scanner is focussing on the plastic which would make the coins blurry, but beyond that (pointing out the obvious) I&#039;m afraid i can&#039;t help you much, sorry.</p><p><br /></p><p><br /></p><p><br /></p><p>That is the standard format for the 79-81 proof sets (it may extend a little farther each direction, but I don&#039;t remember off the top of my head.</p><p><br /></p><p><br /></p><p><br /></p><p>The dies are continually being reworked in a constant effort to make them last longer and be more visually appealing and productive.&nbsp; Your best bet is to study the coins from each year and you will begin to notice many tiny differences.&nbsp; I&#039;ve heard one person explain that he can tell what year and Mint a wheat cent </p><p>is by looking only at the reverse!&nbsp; This guy has looked hat thousands of coins and has become adept at noticing the subtle year to year differences.&nbsp; Also a while back someone posted a reverse of a modern quarter for us to guess the grade of and one of our members (cladking) was able to determine the exact year based upon the reverse.&nbsp; This is from his having searched though thousands of quarters.&nbsp; I&#039;d venture to guess that there is no official book on the subject because it is just so minor a part of numismatics, who would buy it?&nbsp; Especially when you consider how gigantic such a work would be!</p><p><br /></p><p>As for the differences you are noticing, the circulating US coins (cent, nickel, dime, quarter, &amp; half) were all redesigned in 1991 to &quot;strengthen&quot; the design.&nbsp; This involved adding a ton of detail to the busts, mostly in the form of squiggly hair lines, in fact in my type set the post 1990 coins are described as the &quot;spaghetti hair&quot; variety of those coins.&nbsp; I think they look silly, but the mint thought it was a good idea, so it stuck.[/QUOTE]</p><p><br /></p>

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