Napoleon Portrait Epoch of Italian Campaign 1796-1797 Signed on back Marked on front Lava? Stone? Framed

Recent estate auction purchase. I believe this one slipped by the auctioneers. It was tucked into a hanky in box full of vintage tatting. I have taken many pictures to assist you in determine age, material and possibly maker. I can tell you the cameo has been repaired. This is obvious in the pictures. Overall size in frame is 2 1/4” X 2 3/4”. Cameo measures approximately 1 1/2” X 1 7/8”. Authentic Young Napoleon Portrait of Italian Campaign 1796-1797. There is also something on the front side under the bust that can be seen in the middle picture. Partial letters look like “BONY” (Bonaparte). Signed on back and marked on front. Lava? Stone? Framed I can tell you the cameo has been repaired. This is obvious in the pictures. There is a signature on the back.