Exterior: Bright titanium case (partially made of ceramics) Back lid specifications: See-through screw back Glass material: box-shaped sapphire Coating: Internal anti-reflective coating Lumibrite: Yes (hands and indexes) Case size: Width 43.2mm Height 51.5mm Thickness 15.3mm Band width: 23mm Nakadome: One-push three-fold method Arm circumference (longest): 187mm Movement: 9SC5 Instructions Drive system: Mechanical automatic winding (with hand winding) Driving period: Lasts approximately 72 hours at maximum winding Static accuracy: average daily difference +5 seconds to -3 seconds Accuracy is based on Grand Seiko's own standards when measuring the movement as a single unit before shipment from the factory under conditions of 6 position differences and 3 temperature differences. Accuracy under the environment in which the customer will actually use the product (mobile accuracy) differs. Also, due to the characteristics of mechanical models, depending on the conditions of use (time of use, temperature, arm movements, strong shocks or vibrations), Waterproofing: Reinforced waterproofing for daily life (10 ATM) Antimagnetic: Yes Weight: 154g others: Screw lock crown metal allergy resistant With tachymeter Number of stones: 60 stones Stopwatch function (30 minute total/12 hour total)