Stereoscope ‘Stereoskop Model 1928’, Glass and Metal

The stere­o­scope was man­u­fac­tured and sold by Carl Zeiss Jena. The instru­ment was also dis­trib­uted by the opti­cal com­pa­ny Ocu­lus. Ocu­lus may also have held a licence to pro­duce the view­er. The Stere­oskop mod­el 1928 was a replace­ment for the Ver­ant, intro­duced in 1903.
The stere­o­scope could be equipped with dif­fer­ent lens­es. As with the Ver­ant stere­o­scopes by Zeiss, it was like­ly pri­mar­i­ly intend­ed for sci­en­tif­ic and indus­tri­al use.

(from: Com­pendi­um of Stereoscopes)