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<p>[QUOTE=&quot;Roerbakmix, post: 3630951, member: 100731&quot;]I&#039;ve recently bought this medieval little coin, as I liked the observe.</p><p>[ATTACH=full]973850[/ATTACH]</p><p><b>Ruler</b>: William I de la Roche (1280 - 1287), or Guy I de La Roche (1287 - 1294)</p><p><b>Denomination</b>: Billon denier tournois, minted: 1280 - 1294</p><p><b>Obs</b>: :G : DVX:ATENES: ( : = double trefoil stop, trefoils resembling Y), cross pattée; <b>rev</b>: reverse :ThEBE:CIVIS: ( : = double trefoil stop, trefoils resembling Y), castle tournois with open corner circles, surmounted by cross, distinctive style</p><p><b>Weight</b>: 0.55g; Ø:1.7</p><p>Metcalf Crusades 1030, Malloy Crusaders 85</p><p><br /></p><p>There is some green encrustation on the coin, both the observe and the reverse. I have two hypotheses:</p><p>1) it&#039;s the copper in the billion coin that is oxidating</p><p>2) it&#039;s the result of some PVC holder of the previous owner</p><p><br /></p><p>How would you commence removing it? Would you? For option one, a low dilution of citric acid may do the trick (risking a pitted surface); for option two, aceton may be best suited.</p><p><br /></p><p>The next question: this coin is somehow related to the crusades. I lack the knowledge to see why. Who could give some insight?[/QUOTE]</p><p><br /></p>

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