The bidirectional, rotatable deep blue and burgundy bezel on the Tudor Black Bay GMT is calibrated for 24 hours—the 12 daylight hours are on the burgundy section and the night-time hours on the blue. Additional time zones can be indicated by a red Snowflake hand, which traverses the dial in 24 hours. The Black Bay GMT comes with a choice of a riveted steel bracelet with polished and satin finish, a “Terra di Siena” brown leather strap with folding clasp and safety catch, or a black fabric strap with a burgundy band.