Grand Seiko models SBGW251/252/253: Cases; steel, 18k gold, or 999 platinum. All cases 3 bar/30 meters water resistant, with domed sapphire “high definition” crystals with antireflective coating. In platinum and gold, 38mm x 10.7mm; in steel, 38mm x 11.2mm. Antimagnetic to 4,800 A/m (amperes per meter)., hand-wound caliber 9S64, 28,800 vph, running in 24 jewels. -3/+4 seconds maximum deviation in daily rate; SBGW251 adjusted to -1/+5 maximum daily rate deviation.