OMEGA has continually made significant contributions to the art of watch making since its founding in 1848. While OMEGA has distinguished itself in a number of different professional areas, the brand has always remained true to: innovative watchmaker. Case: Brushed and polished stainless steel Case back: Transparent, screw-down Bezel: Polished stainless steel Dial: Black, linear guilloche Hands: Silvertone, luminescent Markers: Silvertone luminescent indices Calendar: Date display window at the 3 o'clock position Co-Axial Chronometer Bracelet: Brushed stainless steel Clasp: Push-button deployment Crystal: Sapphire Crown: Screw-down Movement: Swiss automatic Power reserve: 50 hours Water resistance: 15 ATM/150 meters/500 feet Case measurements: 34 mm in diameter x 13 mm thick Bracelet measurements: 16 mm wide x 7 inches long Box measurements: 6.5 inches wide x 4.5 inches long x 6 inches high Model: 184.108.40.206.01.001 All measurements are approximate and may vary slightly from the listed dimensions. Women's watch bands can be sized to fit 6.5-inch to 7.5-inch wrists. A screw-down crown (knob) creates a water-resistant seal.