Lg. KPM Hand Painted Porcelain Plaque. Large oval portrait plaque depicting Raphael’s Sistine Madonna; artist signed R. Dittrich, signed on the back with KPM and scepter mark and size number “5” under and “F”. In excellent condition. Measures: 10.75 in. high x 8.75 in. wide. Weight: 2.25 lbs.