The timeless P-38 LIGHTNING® with a 42 mm black dial and sapphire crystal comes with a brown leather strap with Luminox signature buckle. The GMT function for dual timezones makes it a must-have for any worldwide traveler. A nod to the traditional B-Uhr navigation watch of the 1940's, just below the 12 o'clock is an upwardly pointing triangle with two dots, providing quick orientation and the ability to read the time at a glance.