SEIKO 5 Time Sonar Skeleton - Automatic Skeleton Dial Seiko 5 SRPJ47K model has a skeleton-style dial, which is frequently preferred by mechanical watch lovers. 70s Design The SRPJ47K model was inspired by the Time Sonar model produced by Seiko in the 1970s and was introduced as the modern version of Time Sonar, which created a great impact when it was first introduced with its colored glass dials. Functional Mechanism Our watch, which is 100 meters water resistant, works with the automatic and in-house 4R36 mechanism (developed entirely by Seiko). This movement is built on Seiko's legendary 7S26 movement and is renowned for its durability. 4R36, one of Seiko's most trusted movements; It is equipped with highly functional features such as date, day, manual winding and stopping the seconds (hack) when the crown is pulled out. The power reserve is 41 hours. WATCH FEATURES Case Dimensions: 42.5 mm Case Diameter 13.4 mm Case Thickness 46mm Lug to Lug 22 mm Lug Width Caliber Features: 4R36 Automatic Movement 41 Hour Power Reserve Manual Installation Feature Date Function Day Function Hack Feature 23 Stones 21,600 Strokes per Hour Design Features: Brown Glass Dial Stainless Steel Bracelet Stainless Steel Case Stainless Steel Back Cover Unidirectional Rotating Black-Brown Bezel ​Other Features: Calendar Day Hardlex Crystal Glass 100 Meters Water Resistance LumiBrite Hands