This insulator is a CD 126.4 embossed on the front; "W. E MFG. CO. PATENT DEC. 19. 1871" and "W. U." on the back crown. It is a light lime green color and has lots of tiny bubbles in the glass. The insulator is in very nice condition with only a thin flat 7/8" base chip and a flat 1/2" base edge flake. A nice looking telegraph piece. $60.00 plus shipping. Payment by PayPal friends or check. Email any questions. Thanks.