What are the features of the Seamaster Professional?
The Men’s Seamaster Professional full and mid-size watches have: • Highly visible hands and dial markers with large fluorescent marks. • Rotating bezel with fluorescent marker. • Case contoured around the stem to protect it from being hit. • Sapphire crystal, highly resistant to scratching. • Rated for use at depths of up to 300 meters (1000 feet). The Seamaster Pro Chronograph is one of only a few watches where the buttons are sufficiently water resistant that you can use the chronograph features underwater. • Manual date change from stem without altering the time setting. (Not on the GMT.) • Models with metal bracelet have a special clasp that opens the bracelet an additional inch or so to fit over the outside of a diving suit. (Not on the GMT.) • ‘Helium relief valve’ — a feature only needed if you are in an extended stay in a helium-rich diving bell environment. This is probably useful to only 0.0001% of the owners of this watch.