Antique hand painted scenic best ceramic brooch

Early 20th Century hand painted brooch featuring a riverside landscape. The brooch is painted on best a ceramic plaque marked 50 on the back and mounted on what I believe to be a pinchbeck frame with rope twist border. It fastens with a plain C clasp on the back. It measures approx 4.5cm x 5.5cm. It was purchased from auction and came from a large country house estate.