Made for travel, bad light, and the kind of days that refuse to stay on schedule, the BALL Engineer III Endurance 1917 GMT GM9100C-S2C-IBE turns Shackleton grit into a sharp modern GMT. The 41mm 904L round case is only 13.15mm thick, paired here with an ice-blue dial, date at 3, polished steel bracelet, and a red-tipped GMT hand for quick orientation. Its RRM7337-C automatic manufacture chronometer offers true GMT function, letting the local hour jump from the crown while home time keeps tracking. Gas-tube illumination on the hands, markers, and 24-hour ring keeps it readable when the lights quit.