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<p>[QUOTE=&quot;physics-fan3.14, post: 2506190, member: 19165&quot;]I think all 3 terms convey the meaning of what the marks are. They are imperfections originally on the planchet (OPSI), which were imparted during the tumbling process, and visible on the high points due to an incomplete strike. </p><p><br /></p><p>And, to return to the point of this thread - one of the high points where they are often seen is on the steps of the Jefferson nickel. </p><p><br /></p><p>All that to say - when high point pitting or OPSI occurs on the steps, it doesn&#039;t really matter why the steps are incomplete. The steps are incomplete. This precludes a FS designation.[/QUOTE]</p><p><br /></p>

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