This beefy Swiss-made watch boats aviation-inspired operating features like 24-hour GMT functionality and the ability to calculate and record crosswinds. It's got screw-down crowns on both sides of its burly steel case, a rotating bezel and a smooth, topstitched leather strap. 46mm case Buckle closure Quartz movement Date window, 24-hour GMT and crosswind functions Rotating tachymeter bezel Water-resistance to 10 ATM (100 meters) Sapphire crystal face Stainless steel/leather Swiss made