I just want to add a little note about the aureus of Carausius pictured below.
I have had it confirmed that it is not a die duplicate of the Trau/Ashmolean specimen, although very similar. There is aso a small provenance for this coin. It first appeared, it would seem, in the Dorotheum sale number 414, 16-17 November 2011, where it was lot 304. No prior history known for this specimen.