US Post Civil War Army of the Potomac Re-Union Badge 1882

Original era manufacture. Large, cast silver color six pointed star with an integral suspension loop at the top. The engraving proclaims it to be a souvenir of the Re-Union of the Army of the Potomac, held in Detroit in 1882. Sham Battle, Banquet, Prize Drill, all to be enjoyed at this event. Measures roughly 2 x 2.5 inches, no ribbon. The Sham battle listing is very interesting to me, early re-enactors?