This is an vintage brooch with old world European craftsmanship and styling. There are graceful gold-filled swirls with ruby red prong set rhinestones and a circle of clear brilliant paste stones.
The reverse is marked 1/20 OK Gold Filled with an M in a horseshoe open end up.
This pin is 2 5/8 inches across.
This classic style brooch has the beauty that comes with old world craftsmanship and the rich patina that comes with age.