The Wünsche Mars Detective Camera is a late 19th / early 20th century German-made detective or "spy" camera, a category of disguised or concealed plate cameras designed to be used discreetly rather than on a tripod. Wünsche, based in Saxony, was among several German makers producing this type of body for amateur use during the early plate-camera era.

Sales data for the Mars Detective Camera is extremely thin: a single recorded UK auction hammer result of £940 from 2001 is the only data point available, so a reliable current value or median cannot be calculated. Today, examples in this niche tend to be condition- and completeness-sensitive, and what one is worth in 2026 depends heavily on whether it appears in a specialist saleroom; without recent comparables, any quoted price would be speculative.