Thank you for submitting your item for appraisal. This appears to be a late 20th or early 21st century chinese mammoth tusk carving of a tang style horse on a rosewood stand. Mammoth Ivory is at least 5000 years old and can be traded freely if you can provide a certificate.
Due to recent regulations the trade of modern ivory carvings has become illegal in most of the States in the USA, therefore the value would be purely decorative. If you can provide a certificate for the mammoth tusk ivory the value would be near the high estimate.