Timepieces in the shape of high cylinders were being made throughout the entire 16th century. The movements are made of iron with a fusee.
The so-called Henlein-watch in the Germanischen Nationalmuseum in Nürnberg (Nuremberg, Germany) certainly is the most famous of the watches that are being associated with Peter Henlein. Since the movements of these watches are not polished they show scratches. These have sometimes been mistaken as 'signatures' (e.g. N, P, H).