This is a large carbon filament Edison lightbulb. I am not sure about its rating, however I have an identical bulb made by FEMCO that is labeled as a 115v, 120w bulb. This bulb is a little harder to get than the smaller, much more common carbon lightbulbs from the 1900's. This particular bulb has platinum lead-in wires (the little wires that connect the base wires to the carbon filament). I don't remember how much I paid for this bulb, but I think it was something around $10. This is definitely not the largest carbon lightbulb you will find, but it is indeed larger than the normal-sized bulbs.
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