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<p>[QUOTE=&quot;physics-fan3.14, post: 2245250, member: 19165&quot;]Very interesting example, and very informative. To elaborate a little: the flat, shelf-like ghost image on the vertical stand and top of the loop (on the inside) is the machine doubling. Notice that it is flat and shiny. Notice that it does not show a split serif (most noticeable at the top left of the D, the little &quot;prong&quot; is completely attached). </p><p><br /></p><p>The true doubling shows on the bottom of the loop (on the outside). Notice how it is fully rounded, and appears just like the original impression (just shifted slightly). Notice that this *does* show a split serif, at the bottom left of the D. See the little &quot;notching&quot; there in the corner?</p><p><br /></p><p>These are two really quick and easy ways to tell machine doubling versus die doubling.[/QUOTE]</p><p><br /></p>

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