Need Help Identifying Lightbulb

Those simply look like old style christmas tree bulbs.  There are plenty of options out there, as that is a relatively universal sized bulb socket.  There are street lamp type bulbs with that socket, which are larger round bulbs with white painted bulbs.  Anyway, several options available.

This is a bulb for street lamps.

Larry

Those are Christmas tree bulbs and are generally rated at 15 volts. They are generally referred to as C-6 lamps.

If you are worried about burning them out, place a diode in series and they will last.

Look at eBay item number  401643123728

The eBay description is incorrect. They are 15 volt bulbs and a string of 8 of them are used for 120 volt power.

I believe what you have for lamps are the old style C-6 Christmas tree lamps. They ran 8 in series on 120 volts so they would be 14 volt lamps. I believe that is a miniature screw base.  Between the voltage and base they were compatible with toy trains, so many of them ended up in toy train service. There are collectors of vintage Christmas decorations and a lot of these lamps have been preserved. There may even be reproductions.  Search eBay and see what you find. 

Christmas tree bulbs, they were wired in series for around the tree. You will find them in a lot of prewar and early accessories as the original bulbs burned out and the owners replaced them with a cheap and readily available alternative. I literally have a  jar of them, taken out of accessories I bought or inherited.

They are GE Mazda bulbs. I buy those on e-bay. Any color you want. Just buy a few extras as not all old bulbs can be expected to work.

Chris 

Wow! Thank you all for the help! I figured it was some type of Christmas light but could never find it on google with the search terms I was using