Those interested in this and similar questions may want to obtain a copy of
Late Roman Bronze Coinage, An Attribution Guide for Poorly Preserved Coins by Guido
Bruck. Originally in
German, it was recently released in English (I am not aware of a
French translation). On page 109 there are over two dozen sketches of altars on these coins attributed to the mints that produced them and which rulers made that
type.
Arles has four
types listed.
Using the charts requires a
bit of care. For example, below I show a coin from
London with a
bit similar diamond and dots but
Arles coins like yours have a row of dots at top and bottom while
London does not. Most are easier like the
Siscia below with a crossed X design but some are just no
help with two cities using the same pattern.
The book is not expensive and filled with information. I do suggest you try to find a seller on your
side of the Atlantic. Book postage can be as much as the book. I admit I prefer not to buy coins with missing
mintmarks but the
Bruck book has been handy on several occasions.
