The Langendorf 1003N watch movement is similar to the ETA 717 movement, but with a lower position and an early Incabloc shock device. The exact differences between the Zentra 185 and Langendorf 1003N are uncertain. Most samples of the Langendorf 1003N movement feature two bridge layouts, as shown in the archive. However, there are also samples with different bridge layouts. The Langendorf 1003N movement functions include manual winding, sub-seconds, and Incabloc Shock Protection. It was used during the period of approximately 1935.