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<p>[QUOTE=&quot;medoraman, post: 2646733, member: 26302&quot;]Yes, there are many instances of coins being found dug up and recirculated. However, based on wear data from things like Barber and Lincoln cents in the US, most coins will simply disappear or become unrecognizable lumps after a certain period of constant circulation. So, the answer for coins in constant circulation my guess would be around 100 years or so. After that, they literally are nothing more than smooth round pieces of metal.</p><p><br /></p><p>So I guess it would depend on what the OP meant by &quot;in circulation&quot;. Do you mean the predominant coins most people rely on daily? This would mean within 100 year mintage of current issues. If he meant what MIGHT be found in circulation, it could be nearly anything before the advent of coin collecting. I hear that in the late 1960&#039;s silver coins of Peroz, (5th century Sassanian), were still circulating in Afghan markets. Before coin collectors, any coin found would just be spent, since that was its only real value.[/QUOTE]</p><p><br /></p>

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