This is a 60a single pole, single throw, knife switch.  It comes with two "jaws" and be setup in single pole double throw or single pole single throw.

Brand: unknown

Era: early 1890s (19th century style)

The condition is excellent.  See pictures. The brass looks amazing and is bare with no corrosion.  Well preserved switch.  Fully working.  Ready for installation or collection.

Fast, careful shipping.