Maybe one of these similar products would be of interest:-
Carl Zeiss Jena Tele Negative F-6cm
CARL ZEISS JENA SONNAR Pentaka 8 2.8/40 LENS
Carl Zeiss Jena 5.6/55 mm Lamegon Wide Angle, VERY RARE
?MINT-?Carl Zeiss Jena DDR Flektogon Auto 35mm f/2.4 MC For M42 Lens From JAPAN
Zeiss Ikon Carl Zeiss Jena Sonnar 1.5/5 cm for the Contax II and III Rangefinder