Seiko Astron GPS Solar 5X Caliber Seiko by wholesalewatches - June 10, 2020June 10, 20200 Considering that 2012, Seiko's Astron watch has gained magnificent success . In its seven years of production, this version's astounding GPS Solar technology has astonished thousands and thousands of world travelers and watch lovers. Seiko launched the Astron GPS Solar technology using a new calibre called the 5X that supplies the