Antique Miniature Hand authentic Painted Portrait Pin

This antique hand painted and signed, portrait pin is tiny. The portrait authentic without the frame is 1.25" long and 7/8" wide. I believe that the portrait is painted on porcelain. The silver filigree frame is marked "800". There is another very small mark which is not clear. The signature appears to be "M. Coluss". The condition of the pin is very good. The frame is without issues and the portrait is not cracked or stained. Pins like these are amazing little works of art and are to be treasured.