The numismatic tradition of Locri Epizephyrii is a bit peculiar if it's compared to the other cities of Magna Graecia and of the whole Greek world (excepted Sparta, and this isn't surprising because we know that this city had many affinities with the ancient Locri).
As the matter of fact, the Locrian Colony started to mint coins very late, during the IV century b.C. (while elsewhere it was a common custom since the VI century b.C.).

SILVER LOCRIAN COIN (IV century b.C.) (Image source: Prof. G. Incorpora's private archive)

That was caused by the really conservative Locrian ruling class which, following Zaleukos' strict legislation, wanted to preserve unchanged the economical structure of the polis. The agricultural property and its development was always preferred to the commerce development, therefore there was no need to mint coins.
By the way, during the excavations, were brought again to light many coins of the VI and of the V century b.C. (minted in Sybaris, Kaulon, Kroton, etc.) which let us suppose that even if they didn't mint coins, the Locrians usually accepted coins as payment for commerce exchanges.

SILVER LOCRIAN COIN (IV century b.C.) (Image source: Prof. G. Incorpora's private archive)

Thanks to the boards of the Sanctuary of Olympian Zeus, the experts were able to uncover the Locrian monetary system which, even if younger than the ones of the other poleis, proved to be really complex. And this complexity is proved by the large amount of ancient Locrian coins which was brought again to light in both official and illegal excavations (as a matter of fact, many Locrian coins illegally sold can be seen today in many museums and private collections around the world).

GOLDEN LOCRIAN COIN (IV century b.C.) (Image source: Prof. G. Incorpora's private archive)

The coins discovered in the area of the old polis can be divided into three groups: golden (really rare), silver and bronze, and they were minted (in Locri and elsewhere) between the VI century b.C. and the Byzantine age.
The most beautiful and important of them can today be seen at the National Museum of Reggio Calabria; some collections are also preserved at the National Museum of Locri Epizefiri.