The Seiko 5 Sports GMT SSK005K1 is presented in a 42.5mm brushed stainless steel case. It features a black unidirectional rotating bezel that exhibits a gilt 24-hour display that can be used to set the time for another time zone. The bezel is made out of aluminium. The coined walls of the bezel ensure that it is easily operable. A pushdown crown is located at 4 o'clock, it is flanked by a crown guard which ensures that it is not knocked out of place. Hardlex crystal also provides the front and the back of the case with protection against scratches and shattering.