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<p>[QUOTE=&quot;Scuba4fun777, post: 4908184, member: 75199&quot;]It appears that the cutting fluid used to keep the drill bit from overheating caused the damage. However, the slight bulge at the rim near the hole indicates the hole was likely punched. Probably was drilled first, then expanded with a punch. </p><p>This ‘etching’ seems to have permanently damaged the surface, however a TPG conservation specialist (NGC, ANACS, etc.) should be able to confirm that. </p><p>As others have commented, you may want to determine the potential value before investing in any conservation services. </p><p>Should you decide to attempt to conserve this item, please post follow-up data - and pictures, too!</p><p>Good luck in your venture.[/QUOTE]</p><p><br /></p>

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