Item is a small novelty film camera that is disguised as a railroad pocket watch, first produced into early 1900's and sold until 1939. The exposure is made through the winding stem and the winding knob serves as a lens cap, and required special film cartridges. The camera is relatively common, as it was marketed for so long and several variations exist in the "Expo" trademark style, the winding knob, and the viewfinder shape. Black, red, blue enameled versions produced about 1935 are rarer.