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<p>[QUOTE=&quot;physics-fan3.14, post: 3347054, member: 19165&quot;]A Die Clash initiates a new Die Stage. The clash should be visible on the coin produced, and is distinct from those that came before it. Any visible and distinct change should be a new Die Stage, although sometimes very minor changes are not distinguished. A new die crack or a die crack that gets distinctly worse (for example, becomes a retained cud, etc) would be a new die stage. Realistically, die stages are not widely collected with the exception of a few popularly studied series. </p><p><br /></p><p>A Die Clash is not a Die Abrasion, according to the definition here: <a href="http://www.error-ref.com/accidental-die-abrasion/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/accidental-die-abrasion/" rel="nofollow">http://www.error-ref.com/accidental-die-abrasion/</a></p><p><br /></p><p>And finally, a Die Stage is definitely distinct from a die variety. For example, take Overtons in the Capped Bust Half series (the one I&#039;m most familiar with): The Die Variety would be O-101 - based on the positioning of the letters, stars, devices and such. Every single coin struck from that pair of dies will be the same variety. However, coins struck very early in their life will have one appearance, a few thousand later there will be a crack or a clash and that will be a different die stage, and late in life there will be a whole bunch of cracks. So, one die variety can make many die stages. </p><p><br /></p><p>In the Capped Bust series, for example, this is denoted with letters - O-101, O-101a, O-101b. Some people try to collect all of the recognized die stages (and some of them are *considerably* rarer than other die stages.[/QUOTE]</p><p><br /></p>

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