The Ernemann Bob (Spy Camera) is an early 20th-century camera produced by the Dresden-based maker Ernemann, sold under the company's broader Bob line of folding plate cameras. As a niche, lower-volume model it surfaces only occasionally on the collector market.

Auction evidence for this model is extremely thin: a single recorded UK saleroom hammer result from July 2001 sold for £164, and no recent sales are available to establish a current value or median. With only one historic data point, today's worth is hard to pin down, and any price a buyer pays will depend heavily on condition, completeness and bidder interest on the day.