SEIKO PROSPEX KING SUMO SPB321J1

The Seiko Prospex King Sumo SPB321J1 is an automatic diver's watch known for its large size, robust build, and updated materials like a ceramic bezel. 

Movement

• Caliber: 6R35
• Type: Automatic with manual winding capacity
• Power Reserve: Approximately 70 hours
• Precision: +25 to -15 seconds per day
• Jewels: 24
• Functions: Stop seconds hand function and date display

• Case material: Stainless steel with a super-hard coating
• Case dimensions:
  • Thickness: 13.4 mm
  • Diameter: 45.0 mm
  • Lug-to-lug: 52.6 mm
• Crystal: Sapphire with an anti-reflective coating on the inner surface
• Bezel: Unidirectional rotating bezel with a blue ceramic insert
• LumiBrite: Applied to the hands, indexes, and bezel
• Crown: Screw-down
• Case back: Screw-down
• Water resistance: 200m / 660ft diver's
• Weight: 190.0 g 

• Material: Stainless steel with a super-hard coating
• Clasp: Three-fold clasp with a secure lock, push-button release, and extender
• Lug width: 20 mm 

• Color and texture: Gradient blue with a wave-patterned texture