SEIKO Prospex Sea Heritage Design Tranquil Teal | SPB545

December 2025 Release 

A dial that captures the beauty of Okinawa’s ocean waters

The ocean surrounding Okinawa is renowned for its breathtaking beauty, with crystal-clear water revealing white sandy seabeds. This watch features a sunray-patterned blue dial that reflects light beautifully, evoking the serene image of sunlight shimmering on the ocean’s surface.

A refined color combination

A refreshing blue dial paired with a subdued gray bezel creates a sophisticated and sporty aesthetic.

A new clasp designed for comfort and operability

MOVEMENT

• Caliber Number: 6R55
  
• Movement Type: Automatic with manual winding
  
• Precision: +25 to -15 seconds per day
• Power Reserve: Approx. 72 hours(3 days)
• Jewels: 24
• Functions: 
  • Stop second hand function

DIAL/CASE

• Case Material: Stainless steel
  
• Case Size:
  
  • Thickness: 13.0mm
    
  • Diameter: 40.0mm
    
  • Lug-to-lug: 46.4mm
    
• Crystal: Curved sapphire crystal
  
• Crystal Coating: Anti-reflective coating on inner surface
  
• LumiBrite: LumiBrite on hands, index(es) and bezel
  
• Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster
  
• Distance between lugs: 20mm 

OTHER

• Water Resistance: 300m / 1000ft diver's
  
• Magnetic Resistance: 4,800 A/m
  
• Function:
  • LIMITED EDITION on the case back
    
  • Serial number engraved on the case back
    
  • Unidirectional rotating bezel
    
  • Screw-down crown
    
  • Three-fold clasp with secure lock
    
  • Screw case back