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<p>[QUOTE=&quot;dougsmit, post: 1819655, member: 19463&quot;]I would like to understand the physics explaining why some coins on thin flans show strong obverses and others show strong reverses.&nbsp; It is obvious that both can not be strong when there is not enough metal to fill both dies but I do not understand why they vary in the way the metal was shared between the two dies.&nbsp; On this example, the obverse lost the fight for metal making the portrait textured where the cast flan surface was not smoothed out.&nbsp; The coins in my collection suggest this was common for Valerian and Gallienus but later, by the time of Claudius II, I see more weak reverses and well struck obverses.&nbsp; I would like to understand why.&nbsp; I wonder if this period might have seen some new technology like pincher dies that had some effect on the matter.[/QUOTE]</p><p><br /></p>

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