Will Smith wears a Piaget Polo FortyFive watch in the movie Focus (2015).
In the movie Men in Black 3, Will Smith once again wears a Hamilton Ventura medium watch, this time a Hamilton Ventura Chrono featuring three silver sub-dials on the face (reference number H24412732).
In the movie Men in Black, Will Smith is wearing a Hamilton Ventura with black face, stainless steel case and black leather lizard pattern strap.
Will Smith, in the movie I Am Legend, wears two watches. The most clearly visible is the Swiss Army ST 4000 (24077) watch from Victorinox.