I found a bag of these in an old warehouse I cleared.
They are made of a thin shiny gold metal and are small - big enough for a little finger and maybe a thin ring finger.
On the front are the Greek Comedy and Tragedy masks that have become a symbol of the theatre.
The comedy mask was associated with Thalia, the Greek muse of comedy and bucolic poetry, and the tragedy mask is associated with Melpomene, the muse of tragedy. Upon completion of a play, Greek theatrical masks were placed on the altar of Dionysus, patron god of the theatre.