Designed with a stainless steel case and bracelet and black dial, this 42.0mm Grand Seiko Caliber 9S61 offers high precision and reliability that endures, with 72 hours power reserve. The accuracy of a mechanical watch depends greatly on the precision of its hundreds of individual parts. This is why all the components of each Grand Seiko watch are made by Seiko in-house and to the same high standards. Featuring a see-through caseback, automatic movement allows for self and automatic winding capabilities and features 28,800 vibrations per hour and 33 jewels, with accuracy -3 to 5 seconds per day under static conditions. 100M Water Resistant.