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<p>[QUOTE=&quot;funkee, post: 1492036, member: 37925&quot;]Perhaps there is a master set of numbering heads, and copies are made from the master set, just like the engraving plates.</p><p><br /></p><p>I assume they wear out and are replaced after some use. So if there&#039;s a defect in the design of one digit, causing it to be under or over inked, then that effect is reproduced on all notes until its caught and new numbering heads are made.[/QUOTE]</p><p><br /></p>

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