Alwin,
For Decius' coins you can tell the two mints apart by
style and also that often the
Antioch antoninianii have
officina marks below the
bust. The
obverse legend at
Antioch is the same as the most common
obverse legend at
Rome. Your coin is
Rome, which is a finer
style than that of
Antioch. Your coin is a real beauty too! Such nice fresh dies for boths sides.
Robert,
I don't think that die matches can either prove or disprove the five
officina theory. It is very difficult to do a die match study of these
types of coins (Joaquin Blay's die study of the
Decius Divi series was a monumental task even though it was covering a series far smaller than Gallus
Antioch antoninianii). Whenever I see a die match of a Gallus coin I save the pictures to a special file for later
work, but I have only a few die matches for
Antioch antoninianii - there are just so many dies (I have about 100 die matches for Gallus
sestertii - there seems, unsurprisingly, to be a much smaller die/production ratio). The two ways to test the 'five
officina theory' that I have thought of are:
1. Using a large database of coins with readable
officina marks: arrange the coins by their marks and see if combining coins with the same suspected
officina (for example all the coins with "....", "IV" and "VI") it will result in each
officina (one through four, plus the unmarked) will result in a similar output volume. A large sample is necessary to make this method accurate.
2. Make a database of 'officina mules' (coins that show differrening
officina marks on the
obv. and
rev.) to see if
mules that combine two variations of the same suspected
officina marking (such as "IV" and "VI" as on my coin above) are statistically significantly more common that
mules that connect clearly different
officinae.
Maybe someone can pose some other methods could be used for the test.
Antioch antoninianii for
Decius and Gallus are great areas for study since there has been little concentrated effort so far. Almost all of the documented
hoard data for Gallus coins is little value since
RIC and other efforts did not even distinguish between Gallus two main issues (everyone just lumps them together as one), or between the two
obverse designs for the coins of
Volusian.
Best regards,
Richard