A Watch Camera, being a novelty camera in the form of a pocket watch,
first produced in 1905, called the "EXPO" Watch Camera, with the
EXPO logo featured in a circle on one side. The "winding stem" screws off
to expose the lens. The original film cartridge remains inside. The body
of the camera measures about two and one-eighth inches across. I believe
that this item was made by the Expo Camera Company of New York.