CD 121 W.F.G. Co. / DENVER, COLO. toll line insulator. Smooth base. Steel blue gray ? Heck, these are some of the hardest colors to determine. Hold it one way it looks one color. Turn it on it's side it looks another. Anyway, it looks good whatever you want to call it !!!!! . Small annealing crack on base and a small flat base flake. Crude manufacture as is with most all of these/ $20.00 + shipping. Stock #tb2151.