A 1907 third rail insulator used for under hung feed third rails on the electrified West Shore Interurban from Utica to Syracuse N.Y. $10 each or two for $15. + postage they were used in pairs . Most have small chips or glaze defects related to the manufacturing no markings. These are aprox 6"x6" x3" Here is a view of the other side...[id=280850409] These make great door stops!!!