Seiko 5 Sports Style Automatic SRPE51 SRPE51K1 SRPE51K 100M Men's Watch The Seiko 5 Sports Style Automatic underwent a dimensional shift that made it sit easier on the wrist; becoming a far more wearable watch. It doesnât stand out from the rest of your attire; it plain blends. Itâs polished, fluid sides, the single, thin bezel; the ridged crown and the ergonomically placed crown guards â all sway into a suave symphony!