This is an old Edison Mazda light bulb with a pointed tip. It is an early issue, probably dating from the 1910s or 1920s. It does not work and in fact appears to have been dug, with dirt encrusted on the base, and some scuffs on the glass. The inside of the glass has a charcoal gray cast to it, and pieces of the ultrafine filaments, which originally zigzagged up and down, can be seen loose inside.
Mazda was a trademarked name registered by General Electric (GE) in 1909 for incandescent light bulbs. The Mazda name was created for the tungsten filament light bulb, which had a more predictable lifespan over earlier carbon filament bulbs. The name was used from 1909 through 1945 in the United States by GE and Westinghouse.