* What kind of Mella ware horse is it? Is it a figurine, a decorative piece, a functional item (like a watering can or a piggy bank)?
* What is the size and material of the horse? Is it made of ceramic, porcelain, or another material?
* What is the condition of the horse? Is it in perfect condition, or does it have any chips, cracks, or other damage?
* Does it have any markings or signatures? This can help determine the maker and age of the piece.
* Do you have any pictures of the horse? This would be the most helpful in determining its value.
Once I have this information, I can give you a more accurate estimate of the horse's worth.