The word libral often appears in discussions of ancient coinage in Italy, especially Etruscan coins and the Roman Republican coinage. The context is usually the weight of the as which originally weighed one Roman pound (the libral standard) but decreased over time to 1/2 pound (the semi-libral standard), and further.
Note that many Greek city states (colonies) were founded on the Italian peninsula and Sicily; these are collectively referred to as Magna Graecia. The coinage of those city-states is more closely related to the rest of the Ancient Greek world (which included many colonies along Mediterannean and Black Sea coasts. and generally has no relationship to the Etruscan/Roman units.
It is not the misspelling of Liberal.