There isn't any one place to find the weight
and composition of all the various types
of ancient coins
. These facts are often buried throughout references. When you come across this type
of information, please post it here.
You might be interested in the following plot, which elegantly summarizes a couple of centuries of debasement of the Denarius
(Source: Popular Delusions When to Sell Gold by Dylan Grice - Societe Generale Cross
Asset Research Strategy Document 23 March 2010)