Welcome to flight training. The Torgoen T21 Flight GMT is a one-of-a-kind timepiece that incorporates a functional E6B analog flight computer. Developed by US naval pilots in the late 1930’s, the E6B is a circular slide rule used during flight planning to calculate fuel burn, wind correction, time en route and other stats. This classic timepiece comprised of a Swiss Movement Ronda 5030.D, Italian Leather strap with contrast stitching, High grade Sapphire Crystal, Solid stainless steel, and is water resistant for up to 100M/330FT