Seiko Astron - Caliber 5X

Caliber 5X53 
  GPS controlled time and time zone adjustment
  Dual-Time with AM/PM indication
  Perpetual calendar correct to the year 2100 
  Automatic DST adjustment function
  High speed time zone adjustment
  Time transfer function
  Signal reception result indication
  World time function (39 time zones) 
  Power save function
  Accuracy: +/-15 seconds per month 
   (without receiving a GPS signal and at temperatures between 5°C and 35°C) 

Specifications
  Titanium case with super-hard coating
  Ceramic bezel
  Sapphire crystal with super-clear coating
  Water resistance: 10 bar
  Magnetic resistance: 4,800 A/m
  Diameter: 42.9mm, Thickness: 12.2mm
  Titanium with super-hard coating bracelet
  Easy adjust three-fold clasp with push button release