Postal Insulator, Circa 1881

Here's an insulator that had been on my list for a while. While not rare, they're quite collectible and I don't like to pay more than $6 for an insulator (hence why I've bought probably 50 before I got this one, which was like number 3 on my list).

CD 138 Postal Telegraph Co. insulator made by Brookfield circa 1881.