The two best and my favorite insulators I got from Detroit. They are both cleaned now and look awesome, I hope to add a picture soon. It's great to know these are still in use in Detroit. The CD 125 is the W.U. 1871 embossing with the Pat 1893 added. I think there are only about a dozen known, but who knows how many are still in service at this time, have to be at least a couple.