Casio released in August 1998 a special G-Shock and Baby-G series to support the Polar Science Center of the Applied Physics Laboratory of the University of Washington, Seattle.  There were 6 G-Shock's and 6 Baby-G versions released. This is the AW-500NS-3ET. This G-Shock has no Backlight and a bit clumsy control, when you are used to other G-Shock models. Click on the banner to visit the Polar Science Center website for more information.  Scroll down to see more.