Antique Edwardian Brooch, 2 inches, missing Pin back, unmarked

ERA: True vintage item from the 1900s
MEASUREMENTS: 2-1/4 x 1-1/2 inches
MATERIAL: unmarked metal
LABEL: unmarked
Unmarked dark aged goldtone metal brooch. Open middle, rounded corners, tiny Art Nouveau details.
CONDITION: Good condition. The pin is missing - base is complete, just no wire pin. Aged and tarnished.