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<p>[QUOTE=&quot;ErolGarip, post: 2867155, member: 88736&quot;]I&#039;m not an expert in crack engineering, but, have also mechanical engineering in my background. As far as I remember, the crack starts at the sharp corners/points. A notch is an example on where a crack may start. In this coin with the horse, unless a worker intentionally made a small notch in the die, the probable sharp points in this coin is the horse mouth line which was probably difficult to be made. And, looking at the whole crack line on the coin, it is along the horse mouth line. I don&#039;t think that it was a luck or unluck coincidence. Most likely, the crack started at a point in the horse mouth and propagated along the mouth and continued in whole coin.[/QUOTE]</p><p><br /></p>

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