This is a nice light blue CD 156.1 base embossed American. this is the one embossed AM. INSULATOR CO. N. Y. DOUBLE PETTICOAT/ PAT`D SEPT 13. 1881 NOV 13. 1883. The base embossing is perfect. There is a 1 1/4" upper ridge wire groove chip and a few scattered pings. The wavy line that you see running through the skirt is the edge of the inner skirt. Overall a good looking insulator that I feel is priced fairly at $20 plus actual shipping.