Key hand camera no. 3, American [?]; 3. 5 x 3. 5 inches, the camera based stamped '3', with key operating the four internal plate holders each pivoting on once side of the camera, with lens and shutter, the inside back stamped 20599 and Patented April 14,18[??], An unusual design: each plate holder, which is hinged, rests parallel against each of the four camera sides and the key is used to bring each plate into position for exposure