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<p>[QUOTE=&quot;john65999, post: 8056645, member: 111931&quot;]Following its final blow from the hub, the soft steel die required cleanup. This was and remains completely normal. This was done either manually by an engraver using small tools and emery sticks, or mechanically using a rotating lap charged with abrasive. The purpose was to smooth the inevitable remaining defects. If the abrasive was too coarse or contaminated with coarse particles, they would leave concentric arcs over the entire surface. Something like this should have been caught on inspection. (At certain times, cleanup might have been done after hardening of the die – we simply do not have enough U.S. Mint practices information to make a definitive statement. Mint machinists did not routinely interact with commercial workers in the same line of business; the mints thought of themselves as holders of “secure information” of critical importance and did little writing about techniques.)[/QUOTE]</p><p><br /></p>

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