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<p>[QUOTE=&quot;mikediamond, post: 147904, member: 1859&quot;]It could be a Rockwell test mark.&nbsp; Dies are tested for hardness as part of the quality control process.&nbsp; The marked die is supposed to be discarded afterward.&nbsp; If it was mistakenly installed in a press, then you&#039;ve got a very desirable die variety.&nbsp; Of course, it could also simply be a circular die dent.[/QUOTE]</p><p><br /></p>

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