Original army 2nd class merit badge for orienteering.
Finnish conscripts were awarded merit badges for their sporting skills during military training. Each skill had usually three basic classes and sometimes a master class for national or international success. These badges can sometimes be seen worn on field tunics during WW2.
This is a good condition silver badge with a screw on the back for fastening. there is a manufacturer stamp A.BARCK OY H:KI on the screw.
See photos for details.