Collection: Prospex Sea (Heritage “Slim Turtle”)
Model: SPB315J1
Movement: Seiko Caliber 6R35
Movement Type: Automatic with manual winding
Accuracy: +25 to -15 seconds per day
Jewels: 24 Jewels
Power Reserve: Approx. 70 hours
Functions: Hours, Minutes, Seconds, Date, Stop-seconds (Hacking)
Case Material: Stainless steel with super-hard coating
Case Diameter: 41.0 mm
Case Thickness: 12.3 mm
Lug-to-Lug: 46.9 mm
Lug Width: 20 mm
Crystal:  Curved sapphire crystal
Crystal: Coating Anti-reflective coating (inner surface)
Dial Color: Black
Bezel: Unidirectional rotating dive bezel
Lume: LumiBrite on hands, indexes, and bezel
Crown: Screw-down crown
Case Back: Screw case back
Bracelet: Stainless steel bracelet
Clasp: Three-fold clasp with secure lock, push-button release & extender
Water Resistance 200 meters (20 bar / ISO diver standard)
Magnetic Resistance 4,800 A/m
Weight Approx. 156 g
Key Features:
Compact “Slim Turtle” cushion case design for improved wearability
Seiko Caliber 6R35 automatic movement with 70-hour power reserve
Scratch-resistant sapphire crystal with anti-reflective coating
Professional-grade 200m dive capability
Highly legible dial with LumiBrite for low-light visibility
Robust stainless steel construction with super-hard coating
Designed as a modern reinterpretation of Seiko’s classic 1968 dive heritage