Established on January 8, 1938
It was divided into three levels – gold, – silver; – brown. The award was the medal round with a diameter of 35 mm, which was the obverse Eagle State in the rim of stylized ornament and inscription: ZA long service. On the reverse was the Roman numeral XXX Gold, XX with silver, X with brown laurel based on a twig. Medal was mounted on the ribbon of width, 37 mm in magenta with a longitudinal white stripe width of 11 mm located in the center.