In a very good, slightly worn condition. The core with all of the black paint still present. The ribbing in matt silver, the flanges burnished and all with some patina.
Not marked but a known variation that has been attributed to the company of Petz & Lorenz, Untereichenbach. One piece construction and magnetic. On screw with large plate.
Difficult to find.

Iron based one piece construction(!) and in a very good, slightly worn condition. The centre with practically all of the black paint. The frame with all of the silver plate and some patina.
Not marked but a known variation that has been attributed to the company of Petz & Lorenz from Untereichenbach. One piece(!) construction and magnetic. On screw with large plate.
Very seldom seen variant in good condition.