Crossword Genius

East German currency to 1990 (7)

Ross

I believe the answer is:

ostmark

(Another definition for ostmark that I've seen is " Something circulated by Communists".)

I've seen this clue in the Thinks.com.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.