I think we have been reserving sections like this for the period of the Dutch Republic (starting from around 1578), and using “Dutch States" section for earlier coinage.
So in the section Dutch Republic > Nijmegen, City of, the coins are municipal issues still within the system of Dutch Republic coinage.
Before this, it is striking coins in the system of Spanish Netherlands coinage, which we have under Dutch States. Duchy of Gelderland coins are also being struck in Nijmegen, but named as Duchy of Gelderland, rather than City of Nijmegen (it's really confusing).
For now the coins I mention are in Dutch States > Gelderland, Duchy of. We could also just leave them there, and put “Nijmegen City” in title.