I have a light bulb manufactured by the T-H Elec. Co., Lynn Mass. USA with patent dates of Jan 7, 1879 and May 12, 1885.
The Thomson-Houston Company,
It's a carbon filiment is intact and it has a strange base that is held down via a female thread in the center of the botton of the base.
However, one source says the company was formed in 1883 to product dynamos and arc lighting which makes that 1879 patent date interesting.
I believe it's value would be around $175.
