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<p>[QUOTE=&quot;ksparrow, post: 2043251, member: 7638&quot;]I would like to add that what are referred to as &quot;die polish lines&quot; by perhaps 99.9% of the numismatic community are usually caused by actions taken to touch up the die faces during production. This included abrasives on wooden sticks, cotton swabs, and spinning discs with leather faces or edges coated with fine emery.&nbsp; The dies were hand held, although in some cases may have been touched up while still in the presses.&nbsp; </p><p>&nbsp;&nbsp; The process Doug is referencing was done before the dies were first put into service, and sometimes at intervals during the die&#039;s life to improve striking or to remove more extensive surface damage. Logically, I would expect that polishing a die held in a chuck against the center of a spinning abrasive disc would result in fine parallel arcuate lines on the surface of the die, which would probably be quickly effaced during the striking of coins.&nbsp; I have yet to see coins with that exact look but confess that I don&#039;t have time to examine as many coins as I would like.&nbsp; Jason has PL coins (made from rebasined dies) that show parallel lines from the process but did not look curved to me.&nbsp; This would suggest that die basining was not always carried out in a precisely aligned device but that sometimes the dies were hand held.&nbsp; This is actually confirmed by an account in Roger Burdette&#039;s book &quot;From Mine to Mint&quot; of a worker basining trade dollar dies.[/QUOTE]</p><p><br /></p>

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