This listing is for a 1938-D 5 Mk Reichsmark Hindenburg silver coin, graded MS64 by PCGS.  

This mintmark designates production in Munich, which produced 1,304,000 in 1938. In comparison, over 6 million were produced in Berlin in the same year. 

This is a very rare die crack error coin as can be seen in the pictures. There are only 2 coins of this variety graded higher.