A CD 156.1 is base embossed AM INSULATOR CO / PAT SEP 13 1881. Embossing is bold and perfect. I would call the color a light green aqua or an ice green. The insulator is in excellent condition other than a inner skirt triangular shaped chip about 1/4" wide by 1/4" deep. Asking just $45.00 plus actual shipping cost to your U.S. address. PayPal (friend mode) or check.