Reverse Clock

The Reverse Clock is a special grandfather clock that Father Time has in his workshop, which is featured in the fanfiction story "Smurfed Behind: The Departure". It is so named because the hands of the clock run counter-clockwise. According to Father Time, it basically has the power to de-age anything that enters the clock (except for a time guardian such as Father Time), which makes it the perfect place for him to store his most precious tool which he gives to the Smurfs for time-traveling, the Key of Chronos. Father Time tells Papa Smurf that in another timeline, this same clock had de-aged three adult Smurfs into Smurflings.