This papercraft is a Fob Watch, a watch carried in the pocket, as opposed to being worn on the wrist, based on the British science fiction television series Doctor Who, the paper model created by Hellsword. The First, Seventh and Eighth Doctors all regularly wore and used fob watches. The fob watch carried by the Seventh Doctor was the one used by the First Doctor.
A crucial part of the Chameleon Arch looked like a fob watch. "Chameleon Arch fob watches" once held the Time Lord essences of both the Tenth Doctor and the Master. Such watches were recognisable, as Martha Jones learned, by distinctive Gallifreyan messages on the obverse, and an engraving of a solar system on the back.
On meeting Jackson Lake and seeing his fob watch, the Tenth Doctor thought that Jackson might be an incarnation of himself. When the Doctor turned the watch over, however, it didn't bear any Gallifreyan script and was revealed as an ordinary fob watch.
About this paper model: