SEIKO PROSPEX 1965 HERITAGE DIVER SPB239J1

The Seiko Prospex SPB239J1 is a modern reinterpretation of Seiko's first diving watch from 1965, the 62MAS. It features an automatic movement, a 70-hour power reserve, and a durable case with a super-hard coating. The watch also comes with two interchangeable "Seichu" fabric straps. 

Movement

• Caliber: 6R35 automatic movement with manual winding capacity.
• Jewels: 24.
• Power Reserve: Approximately 70 hours.
• Accuracy: +25 to -15 seconds per day.
• Functions: Date display and stop second-hand function.
• Frequency: 21,600 vibrations per hour (vph). 

• Case Material: Stainless steel with a super-hard coating (known as "Diashield") for scratch resistance.
• Case Dimensions: 40.5 mm diameter, 47.6 mm length (lug-to-lug), and 13.2 mm thickness.
• Crystal: Curved sapphire crystal with an anti-reflective coating on the inner surface.
• Water Resistance: 200m / 660ft diver's rating.
• Bezel: Unidirectional rotating bezel with a coated stainless steel insert.
• Crown and Caseback: Screw-down crown and screw-case back.
• Weight: 106.0 g. 

• Dial Color: Sunray-brushed dark brown.
• Luminescence: Lumibrite on the hands, indexes, and bezel. The lume is a subtle, vintage-style tone.
• Straps: The watch comes with two interchangeable "Seichu" fabric (polyester) straps: one in dark brown and one in beige.
  • The straps are made using a traditional Japanese braiding technique that gives them a textured finish and high tensile strength.
• Hands and Markers: The hands and applied indices have a silver finish.