Grand Seiko Self Dater (43999)
Model 43999 Nickname Grand Seiko Self Dater Movement 430 (5722) Type Mechanical Manual Case material Stainless steel Notes Dial variations: SD, AD Introduced in 1963, it was the first Grand Seiko with a date complication, equipped with Seiko’s proprietary fast-forward mechanism. The watch guaranteed a water resistance of 50 meters (5 atm). Caliber 5722A, initially called 430, runs at 18,000 bph, while the later 5722B version runs at 19,800 bph. …