It's stopped ticking since coming to the gallery...
No particular use
The Wristwatch is an item in the game Ib. It is one of Garry's possessions. When Ib talks to Garry under the sunlight in the Sketchbook, he comment that his watch is broken and that it was working this morning, but it had stopped working when he came to the gallery, likely during his transfer from the Guertena Art Gallery to the Fabricated World. Garry is very fond of his watch.