The Wünsche Mars Detective Camera is an early German plate camera in the 12x16 format, made in the detective-camera style of the late 19th and early 20th centuries. Cameras of this type were designed to be carried discreetly, which is why surviving examples are often referred to as spy cameras by today's collectors.

Auction evidence for this model is thin, with a single recorded UK saleroom hammer result of £550 in 2020. On that basis a clean, complete example would be expected to be worth a broadly similar sum in 2026, though as a wholesale auction figure the price excludes commission and any retail mark-up a dealer would add. Condition, completeness of the original plate holders, and shutter function drive what each example sells for.