A nice original WWII German Zollgrenzschutz collar tab. Single pip to indicate the rank of Zollassistent. Good condition.
 
The Zollgrenzschutz (ZGS) (lit. 'Customs Border Guards') was an organization under the German Finance Ministry from 1937 to 1945. It was charged with guarding Germany's borders, acting as a combination Border Patrol and Customs & Immigration service.