Seiko ASTRON SSH073J1 Seiko Astron limited edition GPS solar men's watch SSH073J1. Titanium black plated (super hard coating) case with ceramic bezel. Black plated titanium bracelet, black dial. GPS solar. Dual-curved sapphire crystal, super-clear coating. Lumibrite on hands and indexes. Movement Calibre Number 5X53 Movement Type GPS solar Precision ±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 years Jewels 12 Functions 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 Titanium (super hard coating) with ceramic bezel Case Size Thickness: 14.6mm Diameter: 42.8mm Lug-to-lug: 50.3mm Crystal Dual-curved sapphire crystal Crystal Coating Super-clear coating LumiBrite LumiBrite on hands and index(es) Clasp Three-fold clasp with push button release Distance between lugs 21 Other Details Water Resistance 20 bar Weight 107.0 Features LIMITED EDITION on the case back Serial number engraved on the case back Screw case back