Seiko SPB181J1
| Movement Type | Automatic with manual winding |
| Power Reserve | Approx. 70 hours |
| Functions | Stop second hand function, Date display |
| Case Material | Stainless steel |
| Case Thickness | 12.9 mm |
| Case Width | 45 mm |
| Case Material | Stainless steel |
| Crystal | Sapphire crystal |
| Water Resistance | 200m / 660ft diver's |
| Weight | 188 g |
| Features | SPECIAL EDITION on the case back; Unidirectional rotating bezel; Screw-down crown; Three-fold clasp with secure lock; Screw case back |