The results of an image search on "ceramic horse sculpture stig lindberg" [LINK] returns a number IDed as Stigs ....but more important than the color mismatch they all have their details (saddle, straps...) painted on and not carved.
One result found on a search of just "ceramic horse" looks like a match but it's page identified it as on "Mid Century Modernist Italian Ceramic Horse" [LINK]... Here's its photo:
But again, I know nothing of antiques - authentic or ripoffs.
identified it as on = identified it as only
I found some on Ebay by Stig Lindberg that look very similar.