Peter Krause wears a Luminox 8250 or 8050 Series watch in 911.

This Luminox watch has an black case with steel bezel, black dial with white numerals and logo, and can be seen in the earlier seasons of 911.

In later seasons, Peter Krause as Bobby wears another Luminox watch.

 The exact same watch is not available anymore at Luminox but you can find other, very similar watches at Luminox or on Amazon:

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9-1-1 is an American procedural drama television series, starring Angela Bassett as Athena Grant-Nash, LAPD patrol sergeant and Peter Krause as Robert "Bobby" Nash, LAFD Station 118 captain, Athena's second husband (seasons 1–8).