1) Decorative disc 
[genus] Phalera is a genus of moths of the Notodontidae family. The scientific name is derived from the Greek phaleros (with a white marking) and refers to the white spot on the apex of the fore wings. ...[military decoration] A phalera was a gold, silver, or bronze sculpted disk worn on the breastplate during parades by Roman soldiers who had been awarded it as a kind of medal. Roman military units could also be awarded phalerae for distinguished conduct in action. These awards were often mounted on the staffs of the unit`s standards. The t...
Decorative disc.