Here we have a WW1 Imperial German Iron Cross 2nd Cross.
This Iron Cross does show some minor wear, but is still in good condition and has not been cleaned for many years, therefor the metal has developed a nice patina.

The Iron Cross was a military decoration in the Kingdom of Prussia, and later in the German Empire (1871-1918). It was awarded to soldiers of the Imperial German Army, Navy, and Air Force for acts of bravery, leadership, or military service in battle.