This is a round Platolene 500 porcelain sign. This particular Platolene 500 sign is red and black with white text. It reads, “Platolene 500” and features a black and white striped border.

This is a round Platolene 500 porcelain sign. This particular Platolene 500 sign is red and black with white text. It reads, “Platolene 500” and features a black and white striped border.