Seiko 5 Sports Automatic Japan Made SNZG09J1-var-NATO28 100M Men's Watch The main reason why people buy Seiko 5s is for their timeless field watch look, built to ward off intense impacts head on or from the sides! This is the kind of watch that you can bring on a hike, wear while working on your car or going to the gym. It has a versatile styling that depends a lot on the strap.