Casio G-Shock DW-5900

Here you are some pictures of the cleaned Casio DW-5900. 
It is the 1st G-Shock with the 3 small graphic sub-dials, released on the 1990.
This watch doesn't have light, quite strange on a G. It has 5 alarms, stopwatch and timer. As all G's it's 200m water resistant.
It is one of the classic G-Shocks, and this unit is in pretty good condition. For sure forgotten on a drawer for long time.
Not only is a special watch due to the 3 sub-dials, it is also one of the watches used on a NASA space mission. The linked picture shows this watch on the left hand of the left astronaut. 
 According to Wikipedia is a NASA Flight-Qualified watch!