IG-179 was an IG-100 MagnaGuard in the service of the Confederacy of Independent Systems during the Clone Wars. After the fall of the Galactic Republic, IG-179 would later reappear as chief lieutenant to Iron Knight Luxum.
It was the sole survivor of its model class to see the early years of the New Republic.
Sources
The Story of General Grievous: Lord of War on Hyperspace (article) (content obsolete and backup link not available) (First mentioned)- The Complete Star Wars Encyclopedia