RE: Insulator help
As usual, Bill has it all correct. The pony was made by Ohio Brass, a B inside an O, the O being difficult to see. Both are very common, about worthless to all except the most recent "Mud" (Porcelain) collector.
Jim Sinsley. I will trade for or buy 1/4 or 1/2 oz. embossed pharmacy bottles from anywhere. Approx. 2 1/2 " tall.