Alpina Men's AL-525GB4S6 Startimer Pilot Analog Display Automatic Self Wind Black Watch Alpina al-525 automatic caliber with 38 hours power reserve, 26 jewels and a frequency of 28.800/H Stainless steel with screw-in crown and screw in transparent case-back Automatic-self-wind Movement Case Diameter: 44mm Water Resistant To 330 Feet