As best I can tell, this is the Croatian court that corresponds to the address on Lloyd Evans’ envelope:
Municipal Court in Sisak
Jurisdiction of the Municipal Court in Sisak:
1. resolves litigation, non-litigation and enforcement cases
2. resolves inheritance cases, land registry cases and keeps land books
3. resolve criminal cases, except for those for which the actual jurisdiction of another court is prescribed by law
4. resolves misdemeanor cases, except for those for which the actual jurisdiction of another body is prescribed by law
5. decides on the recognition and enforcement of foreign court decisions and decisions of other bodies that are in the state in which they were made equated with court decisions
6. perform the tasks of international legal assistance in proceedings within its competence
7. performs judicial cooperation with the Member States of the European Union in proceedings within its competence
8. perform other tasks determined by law
The Municipal Court in Sisak has jurisdiction over criminal cases and the area of the Municipal Court in Kutina.