Zalza was a gelding when he was sold to an American junior rider who rode with Norman Dello Joio. As that career came to a close he was donated to Centenary College in New Jersey. I've tried e-mailing their riding director about him several years ago but got no response, and being a slacker with too many horses already, I did not pursue it. Perhaps we will get lucky and this will be spotted by a Centenarian... there are a couple that read this forum.
I know Zalza! I went to Centenary and he was my FAVORITE horse I have some pictures of him while he was there. I even got to take him to Duncraven and show him once. Zalza had alot of soundness issues with a hind suspensory while at Centenary so was retired in 2008. He went to live with a former graduate in California and I'm sure she still has him. I know she has a facebook so I could give you her name if you were interested!