Size box: 12x6cm./4.7×2.3inch.
Size medal: 3.5cm./1.3inch.
Weight: 70gr./2.4oz.
 
DDR East Germany Medal for Distinquished Achivements. The front of the medal says:"For Excellent Service".
The Combat Groups of the Working Class (German: Kampfgruppen der Arbeiterklasse, KDA) was a paramilitary organization in the German Democratic Republic (GDR) from 1953 to 1989.
The KDA served for the ruling Socialist Unity Party of Germany composed of party members and politically reliable working people, based on dictatorship of the proletariat principles, to be deployed locally to fight civil unrest or invasion. The KDA was a civil reserve force tied to the GDR's Ministry of the Interior and the Volkspolizei, reaching 211,000 personnel at its peak in 1980. The KDA was disbanded after the opening of the Berlin Wall in late 1989.