little-known lid

Family relations who are looking to clean clutter can be a prime Pyrex source. This piece comes to me courtesy of my father-in-law, who kindly allowed me to rummage through some old kitchen items that he kept stored in a cabinet in his garage.

The black and brown patterned lid is one of those little Pyrex mysteries. I have never seen this pattern before and could not find a similar pattern in Pyrex references or on the Web.