陸軍特別大演習 - Army Special Large Maneuvres
記念 - Commemorative
愛知県 - Aichi Prefecture
Cufflinks were made in Nagoya by Tanase Medal Works https://asiamedals.info/threads/badges-and-medals-manufactured-by-the-s-tanase-medal-works.24130/
The most unusual design for the army-related cufflinks.