Exterior: Brilliant hard titanium and sapphire glass. Back cover specification: See-through back. 4-screw fixed back cover. Glass material: Box-type sapphire. Coating: Anti-reflective coating on the inner surface. Lumibrite: Yes (hands and indices). Case size: Width 43.0mm, Length 50.0mm, Thickness 15.6mm. Band width: 23mm. Band material: Rubber. Clasp: One-push three-fold system. Movement: 9SC5 Instructions. Driving method: Mechanical automatic (with hand-winding). Power reserve: Approximately 72 hours at maximum wind. Static accuracy: Daily deviation of +5 seconds to -3 seconds. Accuracy is measured under conditions of 6 positional differences and 3 temperature differences based on Grand Seiko's unique standards before leaving the factory. It differs from the accuracy in the environment where actual customers will use it (portable accuracy). Also, due to the characteristics of mechanical models, depending on the conditions of use (carrying time, temperature, arm movement, strong shocks or vibrations), it may exceed the specified accuracy range. Portable accuracy: Daily deviation of +8 to -1 seconds. Functions: Water resistance: Enhanced waterproof for daily life (20 atmospheres). Anti-magnetic: Yes. Others: Screw-lock crown, metal allergy resistant, 60 jewels, stopwatch function (30-minute counter and 12-hour counter).