Zenith El Primero Defy Mirror, 0391029004/90I001, stainless steel case on a stainless steel bracelet, automatic Zenith El Primero movement (5Hz El Primero 9004) with two escapements beating at 50Hz and 5Hz, 1/100th of a second high-frequency automatic chronograph, central chronograph hand makes one complete rotation every second while the 6 o'clock subdial moves at a normal pace, 30 minute counter at 3 o'clock, small seconds indicator at 9 o'clock, outer 1/100th of a second scale, skeletonized sapphire dial, luminous hour markers and luminous hands coated with Superluminova SLN C1, power reserve indicator at 12 o'clock with a reserve of 50 hours, sapphire crystal, display back, water resistant to 200 meters, diameter: 45mm, thickness: 15.4mm. Like New with Zenith Box, additional straps and buckles, and papers dated 2023.