Previously in the series, Walt wore what appears to be a Casio CA-53W-1 or a similar Casio calculator watch.
Character: Jay Pritchett
Watch: Rolex Daytona
Ed O’Neill wears the same watch in real life as in the show.
Alternatively, he has worn a Rolex Submariner:
Character: Dexter Morgan
Watch: Waltham Self-Winding 25 Jewel