Seiko SPB121J1
| Movement Type | Automatic with manual winding |
| Power Reserve | Approx. 70 hours |
| Functions | Stop second hand function, Date display |
| Case Material | Stainless steel |
| Case Thickness | 13.2 mm |
| Case Width | 39.5 mm |
| Case Material | Stainless steel |
| Crystal | Sapphire crystal with magnifier |
| Water Resistance | 20 bar |
| Weight | 87 g |
| Features | Rotating compass inner ring; Screw-down crown; See-through & Screw case back |