Box Lid. Measures 12.5" x 17.5".
The Snow White "Tap-A-Way Metal Art" set was produced by the Naylor Corporation, circa 1938. It consisted of a collection of eight thick laminated cardboard plaques, each with a foil metal sheet applied to the top which displayed one of the character images. Also included was a spring tapping tool. This was used to give the plaques "Effects Similar To Hammered Copper."
This particular set was unused and sold in auction by Hake's for $172.50 (USD)...
Images and info via Hake's.
Collector Rick Payne recently found another example of the set where all the plaques have been tapped. We get to see what the finished product is supposed to looks like; it does kind of have the appearance of hammered copper.
The Dwarfs measure 3.5" x 5.5" and Snow White 5.5" x 6.5". Each has the "© W.D. ENT." notation.
Additional images and info courtesy of Rick Payne at dadric's attic.