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<p>[QUOTE=&quot;georgeingraham, post: 10490114, member: 6261&quot;]I don&#039;t know if the same applies to metal work but with ceramics and pottery, pieces marked &quot;China&quot; can be dated 1890 to 1919.</p><p><br /></p><p>This may be a long shot, but are those lines on the perimeter of the glass what you believe to be damage? I cannot tell if those lines are in the glass or on the reflective coating on the back.</p><p><br /></p><p>The long shot is my being curious if those are in the glass. That it may not be glass at all but natural inclusions, possibly quartz instead of glass??[/QUOTE]</p><p><br /></p>

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