Casio SGW300HB-3AV - Morris Chestnut - Nurse Jackie
The watch is a Casio sports watch with Twin Sensor, Altimeter / Barometer / Thermometer, plus all the usual Casio features of stopwatch, 5 daily alarms, world time, automatic calendar... The model is available in three colors: green (SGW300HB-3AV, silver (SGW300HD-3AV) or black (SGW300H-3AV) and comes with a choice of three bands: plastic, cloth, or metal. In the tv series Nurse Jackie, we see the green version (SGW300HB-3AV), with a custom brown leather strap.
Thanks to Joe Heiselman for the photos