It is in German, but it nevertheless was made by the Franklin Mint - you can see their distinctive "broken F" or "FM monogram" mintmark, below the line of German text. So presumably it was made in America for sale to the German-language market in Europe.
As jbuck translated, it commemorates the "invention of the mechanical reaper" in 1831 by Cyrus Hall McCormick; you can read about it on
his Wikipedia page. The company which McCormick founded was eventually merged into International Harvester, which issued a
medal here in Australia in 1931 for the centenary of the same event.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis