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<p>[QUOTE=&quot;Any Jewelry, post: 306444, member: 2844&quot;]Prongs are thin spikes which support the plates so they don&#039;t touch. That is why the raised spots are called prong marks, the marks left by prongs when stacking them for firing.</p><p>Different regions and periods have a different number and positioning of the prongs. Not all porcelain has them, but it can be one of the signs to help determine age and region.</p><p>I&#039;ll see if I have the energy to search in the books tomorrow.[/QUOTE]</p><p><br /></p>

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