Hi, I also just got this...
Bue Mountain Pottery (BMP), rearing horse (stallion ?). Hooves, staggered In green glaze, approx 14 inches tall, with a base length of approx 8.5 inches long. Very large. Hollow base with some dark glaze inside. Unmarked. I found it referenced where as Mold/style #122.
TIA
More to come...