I like AE coins of the late Roman period, including Valentinian I and later (AD 364 and following), because many types are very common and priced accordingly, even though many are in high grade. However, many types are not so easy to find in high grade. All too frequently, one side is nice and the other far from it.
Here is an example of a type of AD 388-392 which suffers from this one-sided problem, but which has an outstanding reverse.

Valentinian II (375-392)
SALVS REIPVBLICAE
Victory left, dragging (standing) captive, SMHA
RIC Heraclea 26a.
This coin is 15 mm, larger than usual, which gives room for everything to be on the flan and the reverse was struck from a fresh die, which is highly unusual. If only the obverse were comparable!