Today it is customary to express coin weights in grams, though in older catalogues one may encounter troy grains; usually a conversion table is provided.
Whatever system is employed, it is important to relate that system to the one used at the time the coin was produced.
Some of these attracted the involvement of prominent academics, but the discipline has never penetrated into the university structure.
Numismatics is seldom taught in this country and then only as an adjunct to other pursuits; given the current attitude of colleges and universities to their numismatic holdings it is hard to see when the discipline will assume more than a minor role even in graduate curricula.
The "mark or marks upon it," which certify a coin, are categorized in different ways, and in many cases using terms that are familiar in themselves but have different meanings for numismatists.