This pin base is 8" tall, 2.5 Dia at top, and 4.5 dia at base. I believe it is stamped ptnd. March 13 1893? Under the date it reads Fed M. Locke. It has two area's where it stuck to another insulator, there is also a very flat base chip that resulted from a tap the the bottom edge, you can just barely see it to the right of the embossing. 150. Plus shipping