This porcelain insulator was made by the Ohio Brass Company of Mansfield, Ohio. It is marked by incuse hand stamp with a stylized "B" inside an "O" inside a circle marking and has a manufacturing date mark of 1 79 below that. It is in very very near mint condition with a strong marking and is in a beautiful and unusual butterscotch color. As a bonus, it comes with a full size color copy of a Ohio Brass Company stock certificate. Price: $6.00, plus actual shipping.