Seiko Prospex SPB240J1 Technical Specifications
| Feature | Details |
|---|---|
| Brand / Line | Seiko Prospex (1968 Mechanical Diver’s Modern Re-interpretation) |
| Reference | SPB240J1 (Japan reference: SBDC143) |
| Edition | Special Edition (Boutique Exclusive) |
| Movement Type | Automatic with manual winding capability |
| Caliber Number | Seiko In-house 6R35 |
| Jewels | 24 jewels |
| Accuracy | +25 to -15 seconds per day |
| Power Reserve | Approximately 70 hours |
| Frequency | 21,600 vibrations per hour (3 Hz) |
| Case Material | Stainless steel with DiaShield (super-hard coating) |
| Case Diameter | 42.0 mm |
| Case Thickness | 12.5 mm |
| Lug-to-Lug Distance | 48.8 mm |
| Lug Width | 20.0 mm |
| Crystal | Curved sapphire crystal with anti-reflective coating on inner surface |
| LumiBrite | Luminescent hands, indexes, and bezel pip (cyan glow) |
| Dial Color | Sunray-brushed dark brown / charcoal |
| Bezel Type | Unidirectional rotating bezel with rose gold colored aluminum insert |
| Water Resistance | 200m / 660ft diver’s (ISO 6425 certified) |
| Magnetic Resistance | 4,800 A/m |
| Bracelet | Stainless steel three-link oyster-style with DiaShield coating |
| Clasp | Three-fold clasp with secure lock, push-button release, and solid diver extension |
| Case Back | Screw-down solid case back with Seiko Tsunami motif and “Special Edition” engraving |
| Crown | Screw-down crown positioned at the 4 o’clock mark |
| Weight | Approximately 186 grams |
| Functions | Stop second hand function (hacking), date display window |
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