The "wrestling donut" device is one used on Finnish Crosses of Liberty to indicate that it was a combatant military award. The full size of this is the suspension above the Cross.
A silver device on this red and white ribbon indicates a 4th Class. A gold device would be 3rd Class, and gold device on different ribbons was the 2nd Class in the initial 1918 and renewal 1939 and 1941 versions--so dated on the back.
Germans received the 1918 and 1941 types. This is quite a scarce device on German ribbon bars, as here, though normal on Finnish ones. For complete ribbon bars with these, see the main Article text section.