Limited information available.
The "cameo" is approximately 1" x 3/4" - Size 11
I inherited this ring from my dad 5 years ago. If he were alive today he would be 100 years old. I remember him wearing it even when I was a child. I have no additional information about the ring.
A Gentleman's Gold & Hardstone Agate Cameo Ring, circa 1900
the claw-set rectangular black Italian style bearded warrior with helmet, on a red ground measuring approximately 1" x 3/4", between palmette decorated shoulders - Size 11.