Standing 10" tall and hailing from the M Space Hunter Nebula...and sporting zero paint...it's the Marusan 350 Gigan Blue Sparkle Blank! 
 
Though it looks similar to the "Night Raid Sparkle" version released around the same time, the glitter consistency is a bit different and it has no paint application whatsoever - so you can make him your own! It's truly a gorgeous piece!
 
 
Comes with header and bag.