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<p>[QUOTE=&quot;Oldhoopster, post: 7969395, member: 84179&quot;]I believe the striking process provides the force that joins and seals the inner disk and outer ring.&nbsp; The expansion of the metal helps hold the bimetallic coin together.&nbsp; (Please correct me if I&#039;m wrong, I wasn&#039;t able to confirm this with a quick search)</p><p><br /></p><p>If there is grease on the blank, it could be forced between&nbsp; the inner disk and outer ring and would block metal movement during striking, just as it does on the obverse/reverse surface.&nbsp; I believe this explains the anomalies at the disk/ring interface and small area on the reverse.</p><p><br /></p><p>I could be wrong but it sounds like a reasonable explanation, at least IMO.&nbsp; Any other thoughts?</p><p><br /></p><p>Edit to add:&nbsp; the angular notches on the reverse bother me a little and I don&#039;t think grease explains them[/QUOTE]</p><p><br /></p>

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