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<p>[QUOTE=&quot;Conder101, post: 1042381, member: 66&quot;]Yes I do know of someone who tried to build a complete set using just &quot;acid date&quot; coins.&nbsp; Believe it or not the hardest ones to get are the ones from the late 30&#039;s.&nbsp; For the most part they didn&#039;t stay in circulation long enough to wear the date off completely.&nbsp; Lots of partial dates but few with the date gone.</p><p><br /></p><p>The reason the amout of time seems to vary so much is due to how long the coin continued circulating once the date was gone.&nbsp; The density changes from the strike go just so deep into the coin and the longer it circulated the more of that surface was worn away.&nbsp; A coin where the date had just gone missing would restore very quickly, while one that saw extensive circulation after the date was no longer visible will take longer to restore and may not be restorable at all.[/QUOTE]</p><p><br /></p>

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