The Seiko Presage Classic Series SPB521J1 is an automatic watch featuring the Caliber 6R51 movement with manual winding capability. It offers a power reserve of approximately 72 hours and operates with an accuracy of +25 to -15 seconds per day. The watch has a stainless steel case with a super hard coating, measuring 36.0mm in diameter and 12.5mm in thickness. It is equipped with a dual-curved sapphire crystal with anti-reflective coating on the inner surface. The SPB521J1 includes a deployment clasp with push button release and a see-through screw case back. It is water-resistant up to 10 bar and weighs 118.0 grams. Reference number: SPB521J1.