Okay, okay. I know Thayer did not manufacturer this. Many dealers sold the Welsh Rarebit Pan in the 1920s and 1930s. And thereafter.
Like almost all of them, it's made of tin (except for the wooden handle). It is a versatile prop that can produce livestock (hey, it's a rarebit pan so produce a rabbit!) or bake a cake. Essentially it's a double dove pan without air holes. Poke 'em yourself after purchase. Or else bake a cake.
SOLD. My compliments to the Chef!