Are you talking about the Huge Gold from Giants of Legend?
Wow, takes me back. Lets see (grabs figure from shelf)...
If you've seen the Aspect of Bahamut mini released more recently, its about the same size. Its on a 3" base, is 5" tall foot to wing tip and 3" tall from foot to top of head.
Its hard to compare to the Colossal, because the CRD is freaking monstrous. However, compared to the Gargantuan Black, Blue and White dragons, it is definitely a noticeable notch down in size, just as its a definitely noticeable notch up in size from the various Large Dragons.