The information in this table is from the official Omega web site

Seamaster Gents' Professional Diver Chronometer

SEAMASTER (Sport): accurate, robust, resistant, the watch with cutting-edge technology and materials (titanium, tantalum). This handsome watch, designed for professional divers or business and leisure wear, is worn by Sir Peter Blake and the winners of the America's cup, by the world's fastest swimmer Alexander Popov and by film star Pierce Brosnan. It's the watch which saves the life of The World Is Not Enough hero, James Bond himself!

Ref: 2531.80.00

Calibre

Omega 1120

Self-winding mechanical movement, certified (COSC) chronometer, finely finished with circular graining, Geneva wave decor, polished bevelled bridges and rhodium-plated surfaces

Power Reserve

44 hours

Jewels

23

Water-Resistance

300 m / 1000 ft

Case Diameter

39.3 mm

Crystal

Domed anti-reflective, scratch-resistant sapphire crystal

Special Features

Screw-in crown and case back

Unidirectional rotating bezel

HELIUM ESCAPE VALVE: The helium escape valve was specially developed by OMEGA. During deep dives lasting several days, the helium molecules spread throughout all the matter and penetrate the watch in sufficient quantity to push out the crystal at atmospheric pressure levels. The helium valve prevents this from happening. The valve is used by divers to release helium from their watch while they rise up to the water's surface

Remarks

Seamaster Professional Diver Chronometer models are available in 18k red gold, 18k yellow gold / stainless steel, all stainless steel or in titanium on matching metal bracelet or rubber strap