What a great find. I would love to put it in the Murano Zoo. If you would like to have it in there, just email me your full name and I'll give you credit. It would also be nice to have the height of the horse.
It is one of the better pieces I've seen by Campanella. The decor is known as the "grey effect." It is a sfumato technique that is believed to have been invented by Alfredo Barbini when he was at VAMSA in the late 1930s. From what I've read, the grey is actually created with smoke. I would love to see someone do the technique. Many companies used the technique later, including Marcolin, Nason, and Formia... and alas recently a Chinese company.
These horses are often called Ferrari. Some people call them prancing, though I can't understand that one. They are rearing stallions. I believe the design started in the 1970s and continues to this day. They are popular, since everyone loves horses. I can't put a year on your horse, since Campanella has been around for a while. I like that it is signed so nicely.