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<p>[QUOTE=&quot;robinjojo, post: 4368556, member: 110226&quot;]Yes, the tetradrachm could be a fourrée, but it could also be silver imitation from the 4th - 3rd centuries BCE.&nbsp; Elements of the style of the devices suggests an imitation, along with the odd oblong, somewhat rounded flan.&nbsp; The Athenian design was used by innumerable authorities and private parties to produce coins of varying weights and design variation during much of the 5th-3rd centuries BCE.</p><p><br /></p><p>The coin was broken in half in ancient times to investigate its core.</p><p><br /></p><p>As for the rejoining of the halves, the photo shows mineral deposits on the surface that are consistent with the mineral deposit between the halves.&nbsp; That would indicate deposition between the two pieces over a very long period of time.&nbsp; </p><p><br /></p><p>I did consider the possibility that the two halves were rejoined recently, probably using a resin mixed with powder.&nbsp; I don&#039;t think this is the case with your coin, but one way to test this possibility is to use a hand-held black light (uv).&nbsp; In a dark room shine the light on the coin.&nbsp; If the seam is filled with mineral deposits, there will be no fluorescence.&nbsp; If resin (such as epoxy) was used to bind the pieces together, there will be a very distinct fluorescence of green or blue - it will be unmistakable.</p><p><br /></p><p>If you don&#039;t have a black light, try looking at the area of the join on both sides, using a good high-power glass (x20).&nbsp; If you see glossy surfaces at the join, then you might have resin, with suspended dark particles.&nbsp; A non-resin join would be earthy, granular and not glossy.</p><p><br /></p><p>I find this approach for detecting resin-injected gem stones, such as turquoise, where it is used to stabilize lower grades, and jadeite, where it is used to enhance colors.[/QUOTE]</p><p><br /></p>

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