GER is merely a misprint in Cohen's second edition, no. 173, carelessly copied in
RIC.
The coin described is in
Paris, and that coin actually has
GERM not
GER, according to (a) Cohen's first edition, no. 354; (b)
Strack 347, who visited the
Paris collection and illustrates a
Berlin specimen with
GERM on
his pl. V; (c) the new
Paris catalogue, no. 164, illustrating the very specimen in question on pl. 9, and confirming Cohen's and Strack's reading
GERM!
Your coin appears to be from the same
obverse die as the
Berlin and
Paris specimens, whereas the reverses are from three different dies.