Dry plates

I found this box in one of the oldest skylight photo studios in the Finger Lakes region of New York State a couple of years ago, it is possibly almost 100 years old. There is one plate in it.

Found this info online:
Stanley dry plates get their name from the twin brothers F. E. and F. O. Stanley who invented their own dry plate and went into the dry plate business in 1884. They sold the plate formula to Eastman Kodak in 1904 (according to the Stanley Museum) and focused on their steam automobile. Kodak later sold the formula to Defender, now Dupont, and the plates were allegedly produced until about 1960.