I think this is the [100] embossing, but it could be my eyes. The insulator could be a [085], the back of the dome is very faint, typical for these. This CREB is a mold #4. The color is a grayish purple, I guess this is a little harder to find than the standard purple CREB. The insulator is in nice shape, there is a little chip off the base. The base looks like it has been moved around on the shelf, it has signs of wear. There is a lehr kiss on the back of the dome, this is where the insulator touched another insulator when it was still hot at the factory. Over all I would say the insulator is VNM, I have more pictures if needed. Books 350-400, asking $345, now only $307 plus shipping.