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Valid points. The question of the variation in output per die has been discussed by many authors, and the spread factor is an attempt to account for it in the
What you say is true for some issues of coins, but as you noted, not in the case of the Tiberius denarii I was looking at. There is no good reason not to
... Is that necessarily true? It may be in this case, but if, for example, a coin was struck at multiple mints, coins from the relevant celators could tend to
... It is not nearly as difficult as you think. My study was actually about trying to determine the number of celators involved in cutting all the dies by