SSJ017Astron GPS Solar Limited Edition. With the strong, sleek lines of the Seiko Astron, the worlds first commercially available quartz watch, todays Astron is designed for a new generation of leaders, breaking through to the future with excellence in both innovation and style. Available only in a controlled production run of 1,500, with the serial number engraved on each caseback, this distinctive Limited Edition, with its perfectly sculpted octagonal