In a very good, slightly worn condition. The core with all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein, Oberstein. Three piece construction and magnetic.

In a very good, slightly worn condition. The core with all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein, Oberstein. Magnetisch.

In a very good, slightly worn condition. The core with all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein from Oberstein. Variant pin type. Three piece construction and magnetic.

In a very good, slightly worn condition. The core with all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein from Oberstein. Three piece construction and magnetic.

In a very good, slightly worn condition. The core with nearly all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein from Oberstein. Three piece construction and magnetic. .

In a good, somewhat worn condition with signs of use and age.
Marked on the reverse with „K.O.“ for the company of Klein from Oberstein. Three piece construction and magnetic. .

In a very good, slightly worn condition. The core with all of the black paint, the frames with patina.
Marked on the reverse with „K.O.“ for the company of Klein from Oberstein. Three piece construction and magnetic. .