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: Brushed stainless steel, with Roman numerals engraved Dial: Mother of pearl, guilloche Hands: Silvertone, luminescent Markers: Eleven diamond hour markers, 0.12 carats Calendar: Date display window at the 3 o'clock position Bracelet: Brushed and polished stainless steel Clasp: Push-button deployment Crystal: Sapphire Crown: Push/pull Movement: Swiss automatic Power reserve: 50 hours Water resistance: 10 ATM/100 meters/330 feet Case measurements: 27 mm in diameter x 12 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: 126.96.36.199.55.001 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. Extra links are available through the manufacturer. (We do not provide this service). Automatic movement winds with the movement of your arm. It is recommended that you wind the watch every two weeks.