I think it very likely that the Trau coin, lot 1778 in the sale, has
had S C removed from the
reverse by tooling. It's from the same
obv. die as yours, mine, the
Lanz coin, and presumably the other examples too.
The Trau coin is no broader than yours or the other specimens; the
weight is not given so we can't tell whether it's particularly thick and so overweight. However, preliminarily I see nothing "medallic" about this specimen: it's just like the others but with the original S C removed by tooling.