The Zeiss 10X50 Dienstglas is a military version of the civilian model Zeiss Dekaris 10X50 which was introduced in and remained in production until A center focus version called the Dekarem later, also named the Jenoptem came out in and likewise was made until see: Optically it is very good particularly when the plastic eyecups are removed enabling the viewer to see its entire wide field of view.

Although the serial numbers of Carl Zeiss Jena binoculars from to are fairly consecutive making most of them easy to date, during WW II the company for unknown reasons introduced two additional sequences for certain binoculars while maintaining the original series for others. Notes: The blc marking on the right prism plate is the German wartime code for the manufacturer, Carl Zeiss Jena.