The statistical study of a sample of about 3,000 coins of this Divi series, using the methods described, has allowed us to estimate the number of original dies (600 for the obverse and a few more for the reverse) and to make an approximation of the total volume of coins issued (1).
We have shown the different number of dies originally dedicated to each restored emperor, a proportion that is precisely reflected in the number of coins currently preserved. Therefore, there has not been any kind of subsequent selection due to an alleged damnatio memoriae or other causes.
The study of the known hybrids and their relationship with well-dated series allows us to establish a more secure date than those based on stylistic and historical arguments, which correctly placed it during the reign of Trajan Decius and until the reign of Trebonian and Volusian. It must be emphasized that the relationship that the hybrids give us is not based on the typology of the reverse, but rather on the fact that we have located the specific die that was used both to mint coins with an obverse of the Divi series and the antoninians in Volusian's name.
95% of registered coins are linked by their dies, including hybrids. This demonstrates continuity in production at the mint, in a single office or workshop where all the Divi dies were used and where other dies belonging to the official series of the Rome mint were also worked on.
Through the results of the estimate of original dies and the presence in hoards of these Divi coins, we open the possibility of making estimate on the volume of other issues, such as the antoninians of Decius, which due to their abundance do not allow us for now. to make an estimate of original dies by the same method that we have used for the Divi.
As for the historical context, the initial production of coins of the Divi series corresponds then to the reign of Trajan Decius, conceptually related to the continuity of the celebration of the Millennium of Rome, celebrated two years earlier by Philip, and the will of the empire to recover a prestige that would guarantee political, social, economic and religious stability that seemed to have been lost if not at risk. A few weeks after beginning his reign, Trajan Decius ordered the well-known and extensive persecution of Christians, marking a line that showed the purpose of remembering past times, recovering the imperial cult, persecuting the Christian religion and restoring emperors in whom he wanted to reflect, until the point of adding, of making his own, the name of Trajan, emperor who had taken the empire to its maximum extent. But the historical context of the time was an insurmountable factor, which cut off his reign and gradually other attempts to establish a parallel between two moments of an empire that had changed irreversibly.
(1) The number of coins that a die can produce can be very variable. I recommend the article: De Callata˙, F. Calculating Ancient Coin Production: Seeking a Balance. The Numismatic Chronicle Vol. 155 (1995), pp. 289-311.