Yes, you are correct. But the office is 'dioiketes' with an extra i after O. I think it is also on the seal, but you can't read it because of the off centre strike. A dioiketes was indeed a fiscal official. Usually, a provincial area
of authority is mentioned on seals
(like 'dioiketes of Sicily
' for example), but as your seal show, these officials did always feel the need to specify their office further.