Handsome and practical, this technical watch is both beautifully styled and useful for making precise timing calculations. In the 1950s when this wristwatch was made, chronographs were increasingly prevalent alongside the rapid growth of the aviation and astronomical fields. The 17 jeweled mechanical movement is a robust Landeron caliber 51 known as a "trusty workhorse", made in Switzerland, and as reliable today as it was back then. The fully serviced watch has a 41 hour power reserve, ready for wear on and off the field. The case measures about 37.5 millimeters in diameter and is 12 mm at its thickest point while the lugs measures 20 millimeters. The strap is a new black lizard calf and may be swapped out upon request for another color or style. Our fine watches come with a one year guarantee for the movement and a lifetime of at-cost wholesale servicing.