The Seiko Prospex SPB539J1 "Sandbank Mirage" is a 2025 Asia-Pacific Limited Edition (1,700 pieces) dive watch featuring a unique teal-to-white gradient dial inspired by Maldivian sandbanks. Part of the "Sumo" series, it features a 45mm steel case, 6R35 automatic movement, 200m water resistance, sapphire crystal, and a white silicone strap

Specifications

Movement

• Caliber Number: 6R35

• Movement Type: Automatic with manual winding

• Precision: +25 to –15 seconds per day

• Power Reserve: Approx. 70 hours

• Jewels: 24

• Functions:

  • Stop-second hand function

  • Date display

Case & Band

• Case Material: Stainless steel

• Case Size:

  • Thickness: 12.9 mm

  • Diameter: 45.0 mm

  • Lug-to-lug: 52.6 mm

• Band Material: Silicone

• Distance Between Lugs: 20 mm

Crystal & Visibility

• Crystal: Sapphire crystal

• LumiBrite: On hands, indexes, and bezel

Water Resistance

• 200 m / 660 ft diver’s (ISO-style specifications)

Other Features

• LIMITED EDITION engraving on the case back

• Serial number individually engraved

• Unidirectional rotating bezel

• Screw-down crown

• Screw case back