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<p>[QUOTE=&quot;GoldCoinLover, post: 696935, member: 4336&quot;]Something else I wanted to add, i just read over the sprue part on Numismatic Forgery. The author mentions that usually ancient coins are primary choice for casting, because of their irregular, gobular edge. The sprue is cut off and the point of attachment is burnished or filed (tooled). Or the counterfeiter may pack the entire coin, except for the spot to be repaired, in a wad of special insulating putty, and then use a needle torch to actually melt a small puddle right on the coin&#039;s edge. It blends in, but also is alot less noticiable on ancient coins due to their irregular edge.</p><p><br /></p><p>Something else you might want to do, is from a cast is differential shrinkage. When the coin is expanded from heat, it contracts when it is cooled down. This results in a slightly smaller diameter, as well as the coin being thinner in the diameter. The weight will also be slightly less than the master, so weigh it too.</p><p><br /></p><p>On the other hand, if it is struck, it should be in within (in most cases) the correct diameter, fineness, weight, etc.[/QUOTE]</p><p><br /></p>

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