Original, used East German coin. The 20 Mark coin was the largest denomination value coin issued in the DDR. This one measures about 1 1/4" in diameter. I may have multiples of this issue coin in stock at the moment. Condition of the one you receive will be similar, but not worse than the one shown here and it may be better.
Airmail Worldwide: US$3.50
Airmail Europe: US$2.50
First Class UK: £1