Clock Face and Hands from the Original Big Ben

Origin
Made by English architect Augustus Pugin in the 19th century. Big Ben is one of the most famous London landmarks. Although most think the clock tower at Westminster Palace is Big Ben, the moniker actually only applies to the clock inside. The timekeeping mechanism itself was made to be extremely accurate and reliable. The pendulum inside controlling the movement can be adjusted by adding or removing small coins to alter the center of mass and change its speed. Since the 1850s, the tower has only experienced one major breakdown and has only shut down for maintenance, moments of silence and the London Blitz.

Effects
Turns time back for only 12 hours and 19 seconds in any point in history. They have that same amount of time to wander and explore their environment until thrusted back into the original timeline. The user can radically alter the past and present, by their actions and cause some nasty paradoxes until they are wiped out of existence.