Seiko 5 Sports Field collection These watches have been created with an 'in the field’ military design – taking inspiration from a style originally called a ‘trench watch,’ created to be robust and reliable – echoing the Seiko 5 Sports characteristics. Seiko 5 Sports is known for over fifty years of reliability, durability, performance and value. ‘’5’’ represents the original five key features of every Seiko 5 still present today: Automatic movement, Day-date display, Water Resistance, Recessed crown and Durable case and bracelet. .