I was going to say the same thing Panza did ... I've got most of those in my "lead warehouse" also known as my garage. Beautiful work ... especially given the "technology" at the time.
You have a good eye Panza. Janine was the sculptor of most of the large scale figures for Grenadier. She did not do the Frost Giant or Mate but did the others for Ray Rubin. This particular figure was done as a master for them, but was deemed too expensive to manufacture. Thus it is a one of a kind original by Janine. Amazing that you could see the similarity!!!!!