By the style and quality of printing of wattage and voltage, I could to say without any or none doubt that this bulb is in fact a modern reproduction.
Perhaps it isn't an actual product because the "patina" that can be seen over the brass cap proves some time past from the manufacturing to date.
Furthermore, most of true old carbon lamps were etched over the upper sleeve of the cap, not over the glass surface.
Today is very easy to find these reproduction bulbs, at least here in Europe.
In fact, some European (more precisely German) manufacturers, as "Radium", "Paulmann" and "Osram", has these bulbs at their own catalogues.
Most of modern models are fitted with A60 (A19 on U.S. standards) envelopes instead "S" or pear shape as your are. About cap size, all of them has the regular European Edison cap, the E27, and of course, are rated at 220-230 volts instead 120 v as U.S. models are.
If you want to see a sample of these actual reproduction carbon bulbs, please go to the following link:
http://mis-bombillas.webcindario.com/Carbolight.htmHere you can see one of the lamps I bought to my collection two years ago.
Today these bulbs can be purchased in almost every electric stuff supplier or lighting store here in Spain.
Best regards,
M. Gonz?lez.
http://mis-bombillas.webcindario.com