The first two pics correspond to Woytek's two main
types (with Lambda and Pi-shaped legs respectively). The third and fourth both correspond to
hybrid types which
Woytek identified that have stylistic elements as the second
type (e.g. the narrow
reverse elements) but design elements (e.g. the Lambda legs, and seriffed lettering) of the first
type. This combination suggests that they are probably later coins, from the western
mint(s), that copied some elements of the eastern
types (Marseille or
Italian Gaul) when these became available to the die engravers. In
rarity terms, perhaps 60% of coins are of the first
type, 30% of the second, and 10% of various third-types; as the third-variety are scarcest, their
hoard prevalence isn't enough to say a lot more e.g. whether they are also from Narbo or perhaps from elsewhere in
Gaul or
Spain. I
had not considered to divide them into further sub-varieties as suggested by
carthago but perhaps it is justified.
A die-study would of course
help sort out the "third variety" coins - determining whether they link with each other and/or with the second variety (
pig elephant).
The spiral design on the fourth coin's axe-handle is certainly unusual.