The coin is actually a 10 reichspfennig In 1941 was minted at 7 mints and there is a letter on it. The letter is under the 10 on the reverse.The coin is made of zinc and none of this date are scarce. they are some what rare though in mint state so have a higher value in those grades. It can be found in a dealers world coin box for .25 to .50 cents in lower circulated grades. The lowest mintage was for the J mint mark and it was 30,525,000. They show up all the time so not too many were melted. You have a coin with more history value than a monetary one. In December 1941 the United Sates entered the war. As to the future it may just pay to put it in a coin holder and stick it away for now.