6×30 Dienstglas marked ESO factory reworked Grodenstock piece
Mid war 6×30 Dienstglas manufactured from either reworked or unused pre war parts. The binoculars are made by G. Rodenstock which also is the manufacturer who later used the code ESO. The binoculars are most probably made around 1941 utilising unused pre war parts. Hard to find transitional piece!