I have had this GE bulb for about 20 years but I know very little about it. I looked up the history of the GE logo trying to figure out how old it was and I think it is from the early 1900's based on the small open loop in the script "E", but I am not positive. It has metal covering the bowl of the bulb and there is a small amount of liquid mercury inside. If anyone knows more about it please let me know. I would also be interested in the value of this bulb in today's collector market. I have searched and searched and I cannot find any information or even a picture of a similar bulb online. Although admittedly I may just be looking in the wrong places or using the wrong search terms.