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<p>[QUOTE=&quot;ToughCOINS, post: 3730593, member: 20480&quot;]This coin looks acid treated to me.&nbsp; Not only are the struck details mushy, but so are many of the marks on the coin, which is what one should expect if they existed before an acid treatment.</p><p><br /></p><p>Moreover, the weight and thickness of the coin - both determiners of its fundamental natural frequency - have presumably been reduced by the apparent removal of material.&nbsp; That means the frequency at which it naturally vibrates would change.&nbsp; This is not to say one can expect to hear the coin &quot;ring&quot; like in a test of a silver coin, but it does ring.&nbsp; It&#039;s just at a different frequency, and may not be within the audible frequency range of the human ear.[/QUOTE]</p><p><br /></p>

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