Mechanical automatic movement with Chrono&Date functions with a power reserve of 46 hoursCalibre AN500 for Chrono 2 counters and Date (based on SW-500 modified per Armand Nicolets specifications). Gradient dial with luminous indexes and hands, contrast eyes counters. Stainless Steel 316L, screwed in crown and pushers, fixed bezel with acrylic insert showing the Tachymeter, screwed back. Acrylic crystal