The Contessa Citoskop Stereo is a stereo camera produced by the German maker Contessa (later absorbed into Zeiss Ikon) in the early 20th century. It was designed to capture paired images for three-dimensional viewing, a format that was a mainstream branch of amateur photography in the decades before 35mm dominance.

At UK auction the Citoskop Stereo has changed hands at hammer prices between roughly £74 and £300, with a median around £150 based on the limited results available. Today values are highly condition-sensitive: a complete example with working shutter and clean optics sells for noticeably more than a shelf-worn body, and the wholesale saleroom level quoted here sits below what a restored example is worth through a specialist dealer.