Seiko ASTRON GPS 2020 LIMITED EDITION JAPAN SBXC055 with extra blue strap Used couple of times in Japan strap adjusted Complete with box Movement: Caliber Number: 5X53Movement Type: GPS solarPrecision: ±15 seconds per month (without receiving a GPS signal and at temperatures between 5°C and 35°C )Power reserve: Operating for approx. 6 months (when fully charged), power save: approx. 2 yearsJewels: 12Functions Overcharge prevention function Power save function Perpetual calendar to the February 28, 2100 World time function (39 time zones) Dual-time function Day display Power reserve indicator Time transfer function (Switching between the main-dial and sub-dial) GPS signal reception function (Time zone adjustment, automatic time adjustment) Satellite acquisition status display function Reception result display function DST (Daylight Saving Time) Function to prevent the GPS signal reception (in-flight mode) Automatic hand position alignment function Case/Band Case Material: Stainless steel (super hard coating)Case SizeThickness:13.3mm Diameter:42.7mm Lug-to-lug:49.9mmCrystal: Dual-curved sapphire crystalCrystal Coating: Super-clear coatingLumiBrite: LumiBrite on hands and index(es)Clasp: Three-fold clasp with push button releaseDistance between lugs: 21 Other Details Water Resistance100 mWeight160.0Features Screw case back