I can't find any signatures on back. I believe there might also be Sterling silver underneath. I do not want to cut into this to confirm. The brooch is either numbered 139 or 150.
It looks 150 one way (and to me in person) but in the one picture it looks 139. Please refer to pictures as part of the description. Antique Juliette Recámier Hand Painted Portrait Brooch Porcelain Victorian Vtg.