Original army 3rd class merit badge for grenade throwing.
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 bronze badge with a screw on the back for fastening. there is a manufacturer stamp VELJEKSET SUNDQVIST, HELSINKI on the back of the badge and on the screw.
See photos for details.