6X30 Dienstglas marked dow – rare pre war Czech reworked binoculars

Excellent 6×30 binoculars or Dienstglas in very good condition. The binoculars are nicely marked dow which indicates productionOpticotechna GmbHwhich is a well known ZF4 and trench periscope manufacturer but is not often encountered on binoculars! The binoculars are of pre war Czech manufacture which have been remade into the German 6×30 pattern around 1940. If you look closely you can still make out the pre war Czech markings. Very hard to find binoculars!