Organization ZIK - Zavod za ispitivanje kvalitete d.o.o. - The Institute for Quality Assurance is an institution established in 1957 (during this period Croatia was a member of Yugoslavia) and is now the oldest and largest institution for quality assurance in Croatia.
A product that meets the standards of the Institute is marked with the ZIK standard
The web site of the institute that issue the Standards stamp http://zik.hr/
An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.