I'm afraid one has to wonder whether this isn't just a cleverly patinated
fake combining
portraits derived from two ordinary
denarii.
First, the
portraits don't belong together. The
obverse, with that large
portrait and
legend HADRIANVS
AVGVSTVS, should date from c. 125-8, like the coins on
BMC pl. 54.
Aelius, however, didn't become Caesar until 136 and
his coinage all dates to 137. At that time Hadrian's
obv. legend was HADRIANVS
AVG COS III P P and
his portrait was smaller and different in other ways too. So the genuine
asses of
Hadrian and
Aelius that Guy cites, for example the spec. illustrated by
Cohen on p. 267, have
obv. legend HADRIANVS
AVG COS III P P and a different
portrait.
Second, the
denomination.
Hadrian didn't strike any brass semisses, except for those forming
part of the series meant for circulation in
Syria, BM pl. 83.7, which however again date to 125-8, long before
Aelius came onto the scene. Moreover the
portraits on these genuine semisses have a smaller
head and longer neck so don't match the
portrait on Guy's coin. Since Guy's coin seems to be exactly the size of a
denarius, one has to suspect that it is a
cast derived from the obverses of two
denarii.