A pocket watch was a device used for timekeeping in the 19th century.
In 1845, the DeLorean time machine's keys were attached to a pocket watch. It is unclear, however, if this may have been an effect of the clothing converter trying to find a suitable object to disguise them as.
Behind the scenes
- A poster for Back to the Future Part III depicts Marty, Doc and Clara looking at pocket watches in horror.