Unfortunately I cannot tell what the
ligature is
nor can I discern the
undertype, but I can tell you that many of these
types that I have seen with identifiable undertypes are struck on Sardo-Punic Tanit/bull bronzes, Sicilian trident bronzes. Sometimes I have
had success by gathering a handful of different "candidate" coin images alongside the
overstruck coin image and rotating it and hoping some details jump out. At any rate,
good luck!