Xiphos, by the unit description and model skin. A fair few Greek cavalry (well, the Hippies anyway) seem to have had their kopises swapped for... xiphei ? ...between 0.81 and 0.81a.

Some missile troops incidentally have buggered missile-lethality attributes. Accensi (#231) have 0.26 for their slings, and Levantine Saggitarius Auxilia (#232) an equally queer 0.321 for their bows. And the Sarmatian and Mardian Foot Archers (#s 293, 294) still have buggered mount_effect values - +4 against horses and camels...?

There's probably more, but these are ones I remember now.