Circa 1958 “Sperzel” brand toilet seat.
This seat appears to have not ever been installed. It’s still nice and glossy, with no apparent wear. It’s for round front applications, and we suspect it was made for Crane, as it features the raised section in the middle of the lid, and that was a design feature Crane often used in their products. The material used in the making of this seat is a black composite. One only!