Hello Bernt,
this is a part of the series "Deutsche Könige und Kaiser" / "German Kings and Emperors". The Serie was initiated from Dr. Vollrath with the collectors from vienna. All flat were designed by Mano Winter and engraved by Lecke. The series contains around 100 pieces, Kings, Queens, Emperors and additional pieces. Starting from Carolus Magnus and closed by Franz II. But I don´t know actually owner of the moulds.
Best regards
Henry