The coins below show something that I find interesting. The first HERC DEVSONIENSI is silver (22x23mm 3.7gm) while the second is bronze (21x22mm 2.9gm). I would guess that the bronze coin was originally silvered. The coinage of Postumus was slowly debased, but it seems odd that they used the same reverse for silver and bronze, without any time (or any significant time) separating the issues. On a side note, these coins should not technically have the same RIC number, but RIC V is very much outdated. I am getting ready to read Drinkwater's The Gallic Empire: Separatism and Continuity in the North-western Provinces of the Roman Empire, A.D. 260-274, perhaps this topic is discussed in the book.
Postumus
A.D. 265
AR Antoninianus
IMP C POSTVMVS P F AVG; Radiate, draped, cuirassed bust right.
HERC DEVSONIENSI; Hercules standing facing, head right, right hand resting on club, bow in left hand and lion's skin draped over arm.
RIC V 64
uncertain Gallic mint
