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<p>[QUOTE=&quot;Jamericon, post: 1347798, member: 18294&quot;]The secret marks appeared on new portrait plates only for 1928B $10 FRNs. They did not appear on 1928 $10 GCs; apparently the BEP never botthered to make new potrait plates for that series. </p><p><br /></p><p>The 1928C $10 FRNs were all new potrait plates, but the mark wasn&#039;t needed anymore because no old portrait masters remained in use. </p><p><br /></p><p>For as obvious as the mark is now, it was a finding a needle-in-a-haystack to first locate it.</p><p><br /></p><p>Jamie Yakes, co-author of that article.[/QUOTE]</p><p><br /></p>

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