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: Polished stainless steel Case back: Stainless steel, screw-in Bezel: Brushed stainless steel, with Roman numerals engraved Dial: Mother of pearl Hands: Silvertone Markers: Silvertone indices Bracelet: Polished stainless steel Clasp: Push-button deployment Crystal: Sapphire Crown: Push/pull Movement: Swiss quartz Water resistance: 10 ATM/100 meters/330 feet Case measurements: 27 mm in diameter x 9 mm thick Bracelet measurements: 18 mm wide x 7 inches long Box measurements: 6.5 inches wide x 4.5 inches long x 6 inches high Model: 220.127.116.11.05.002 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. Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. Automatic movement winds with the movement of your arm. A screw-down crown (knob) creates a water-resistant seal. To uns crew the crown, turn counter-clockwise and pull/push into position to set time, date, and other functions.