Looks similar to the Peruvian saddles, just with a bit deeper of a seat. Which would make sense, since the Peruvian saddles are descendants of the Spanish saddles. I've ridden in a Peruvian saddle (on a Peruvian paso). The most comfortable saddle I have EVER sat in, including my Aussie, which I adore.
Difficult to see in this pic (it's a scan of an old 3" by 5" and I had my Photobucket uploads set to smaller), but you can see the position the saddle put me in. This particular ride was about four or five hours long and over fairly rough terrain (this was one of the few non-rocky places in the trail). My butt wasn't sore at all and I could walk just fine afterward (which is more than I can say for riding an hour over relatively flat roads in a western saddle).