Antique Portrait Lithograph Button depicting Charlotte Corday with Glass Stones

This is an antique lithograph button depicting Charlotte Corday, the French Revolutionary assassin who killed Jean-Paul Marat, with cut glass stones framing the photo. There are two stones missing, and there is some color loss, mainly on the back. Overall, the piece is in very great condition and was likely made in the late-1800s or early-1900s. Approximate Diameter: 1.25in