CNG Mail Bid Sale 69 showed a coin from Colybrassus, struck for
Valerian II, Lot 1095.
Comment: "The
obverse legend with OVA
LEPIANON in the accusative and the
eagle beneath the
bust indicate that this coin was struck for
Valerian II. upon
his death. (...)"
Unfortunately, I don't know why the
eagle is showing up on your
Gallienus coins from
Side too, it seems, however, the only town "breaking the rule". Hopefully someone else can explain it...
Regards
Lars