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<p>[QUOTE=&quot;physics-fan3.14, post: 2537766, member: 19165&quot;]If I understand what you are saying, I think you are on the right track. Die polishing will change the surface of the die, which may affect metal flow. However, remember that luster is primarily from the movement of metal during striking. After a die has been polished, the luster may be slightly different, but should still be present. </p><p><br /></p><p>A more extreme form of die work is known as &quot;basining.&quot; In this process, the entire surface of the coin is refinished or polished. This caused many of the PL Morgans you see. Basining a die would be much more likely to affect the curvature of the fields, as you mention. It would still make a cartwheel luster pattern when it strikes a coin, however, because the luster is from the movement of metal during the strike.&nbsp; </p><p><br /></p><p>On your coin, I still think the hairlines you see, and the lack of luster, are from cleaning and not from die polishing.[/QUOTE]</p><p><br /></p>

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