Hi Eugene,
I'm a little surprised no one has replied yet.
Your information is quite clear, as is your picture, so here goes. This bulb is not at all unusual.
The age of your bulb is indeterminate, but it looks well used, judging by the faded colour. These bulbs are intended to run in a series connected string of eight bulbs across North American mains supplies of nominally 117volts: 8x15=120. The cap is Miniature Edison screw (MES), as used for flashlight bulbs. The international description of this cap is E10 (E for Edison Screw), 10mm diameter. You asked if this bulb has a "C?" name: yes it does - C6 (C for conical shape, 6 for 6-units of 1/8" maximum diameter). The shape and size descriptors are much abused with Christmas bulbs, particularly figural bulbs.
That's enough from me for now. You've probably realised I'm not in USA, but in UK.
Regards, Howard.