Although in non-working condition, this bulb appears to be a rare and collectible Westinghouse-Based, turn-of-the-century Sawyer-Man carbon light bulb, with porcelain insulation. In general, Westinghouse-based bulbs in working condition are quite sought after, especially if they are insulated only with plaster (which is an early design) and do not have a porcelain disk at the bottom (which is a later design). But since this particular example has a porcelain disk, and is not in working order, it is not worth anywhere near as much. Regardless, it is still a real, handmade, 120 year old light bulb.

This bulb has a unique, Y-shaped stem. I believe this stem design is a Sawyer-Man design. Sockets for this type of bulb are also quite sought after. This bulb contains a squirted cellulose, hairpin-shaped, carbonized filament, which looks very much like a black cotton thread when viewed up-close. As you can see, the filament is broken, which explains why now it looks more like two long hairs than a hairpin.

Westinghouse bases may appear to be much larger in pictures than they really are. A person who has never seen one may think that they are as large as a mogul base, but they're not. Actually, they are the same size as a regular edison (E26) base, the common base type used in America.

If you have more information about this bulb, please don't hesitate sending that information in.