Seiko SMGG21
| Movement Type | Quartz |
| Functions | Rotary switch, Chronograph up to 100 hours in 1/100 second increments, Alarm function (single-time alarm), Dual-time function, Battery life warning function |
| Case Material | Stainless steel |
| Case Thickness | 10.6 mm |
| Case Width | 37 mm |
| Case Material | Stainless steel |
| Crystal | Hardlex |
| Water Resistance | 10 bar |
| Weight | 107 g |
| Features | Rotating bezel; Screw case back |