Here is a nice CD 121 C.D.& P.T. Co. that looks like it could have been made by the Elmer Glass Co.(it has a small ring on the inside of the top of the pin hole). The color is what I would call a light yellow green (better than lime but not as good as medium yellow green). Pictures were taken inside in a 5000K fluorescent display case. The insulator is MINT. Priced to sell at $160, which includes shipping. Payment by PayPal only as a friend of the family using this email address.