This is a Border Incident Service Medal, awarded to those who served in the border conflicts that occurred between May and September 1939. This medal was given to those involved in the border disputes between Manchukuo and the Mongolian People's Republic, with the majority of recipients being Japanese soldiers. The Border Incident Service Medal was one of the pre-war Japanese decorations, particularly associated with the Nomonhan Incident. The case is considerably damaged, as the medal is 86 years old.