The
Syracuse coinage arrangement and chronology is not an easy issue...
I've attached a summary of the
Boehringer Arrangement in 1929,
still in use as reference : 25 series within 6 groups.
I have also attached the original
Boehringer chronology, the Carmen Arnold-Bucchini chronology which is largely accepted (based on the study of the the
Randazzo hoard) and the Hoover most recent proposed chronology (based on ??).
As shanxi and Altamura wrote, the "massenprägung" is the massive coinage that has occured in a very short period of time ( circa 3 to 4 years) after the battle of
Himera with the 2000 talents of the Carthaginans. It concerns
Boehringer number 121 to 291 -> 83
obv. dies and 118 rev dies identified by Boheringer.
The most recent researches from historians (eg Franco De Angelis 2016) assign the Massenprägung coinage to Hieron because of
his building up of Syracuse's navy in the years before the battle of Cumae . So 478 to 474 BC.
Note that a key
stone of the sicilian chronology is the date of the famous Demareteion decadrachm that belong to group 12e and wich is an other story
