The Hemingray 42 was one of Hemingray's most popular and prolific insulators. In fact, it is by far the most searched for insulator on this web site. These were manufactured by the millions, so most are extremely common. This style replaced the also-popular Hemingray No.40 (CD 152) in 1921. It was intended for telegraph usage, and can still be found all over the U.S. on telegraph poles beside railroad tracks. $25 O.B.O. for both.