Watched - Coin to Watch

The perfect "signed" coin to watch!

WATCHED is the next generation "Card to Watch". It is totally new. WATCHED is a specially designed fully functional timepiece.
This watch is revolutionary in its design and ease of use. This effect can be performed anywhere, anytime.

Imagine, taking a borrowed coin from an audience member. Have them initial one side and you the other.
The coin vanishes only to appear under the crystal of your wristwatch. Sounds vaguely familiar, doesn't it?
There have been other attempts to create this mystery. However, they use a non-functioning watch and gymnastics to get the job done.
WATCHED is the perfect "signed" coin to watch.