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<p>[QUOTE=&quot;desertgem, post: 1971868, member: 15199&quot;]If you are searching these out&nbsp; using an USB microscope, be sure to check them with a loupe and single light also. It is difficult with the low contrast of an USB microscope to tell if one or more area is raised or flattened. When it has more than one light ,coming from opposite sides, the edges of the letter/number can be brighter than the middle and look like a doubling line down the middle of the letter/number. Even though your eyes or magnifying device may stay the same, with experience your brain will start to recognize varieties . It does take time, we all know.[/QUOTE]</p><p><br /></p>

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