The Grosia Banknotes should be in a new ruling authority. The Grosia Banknotes were issued by the Provisional Administration of Greece (1822–1827) and so they should be in that ruling authority.
As they have the emblem of the provisional government, were minted and distributed by it and are singed by The President Alexander Mavrokordats. An other option would be to adjust the date on the ruling authority of the First Hellenic Republic 1828-1831 to 1822-1831 so that the Grosia BANKNOTES have a plase.
https://en.m.wikipedia.org/wiki/First_Hellenic_Republic

Seal of The Provisional government of Greece
Bankonotes issued between 1822 (and 1824)
