The E. Krauss Prototype Camera is a one-off or pre-production specimen attributed to the French maker E. Krauss, a Paris-based optical and camera firm active from the late 19th into the mid-20th century. As a prototype rather than a catalogued production model, it sits outside the maker's standard line and is of interest primarily to collectors of experimental and pre-series photographic equipment.

Reference data for this prototype is extremely thin: a single UK auction hammer result of £650 in March 2018 is the only datapoint on file, so any sense of what one is worth today rests on that lone sale rather than an established price band. As a wholesale saleroom figure exclusive of commission, it suggests the value sits in the low-to-mid hundreds of pounds, but with only one record there is no meaningful range or median, and the next example could sell for materially more or less depending on provenance and bidder interest.