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<p>[QUOTE=&quot;satootoko, post: 37951, member: 669&quot;]Welcome to the forum Alberto.&nbsp; Now I know who to ask any questions that might come up about Spanish coins.My last experience in the printing business was in the early 1950s, so it may not be relevant in today&#039;s industry, but your quoted comment might contain part of the answer to your question.&nbsp; Intaglio printing is almost like embossing, resulting in high and low areas.&nbsp; If there is a high area that is rubbing against the heavily inked opposite side of the adjacent sheet of bills, there could be a slight ruboff causing that mark.&nbsp; The ink used on U.S. bills <i>does</i> have a tendency to smear a little when rubbed, and in the printing process each printed sheet rubs against the previously printed sheet.[/QUOTE]</p><p><br /></p>

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