I'm currently working on a larger post that I hope to have up in the next day or so. In the meantime, here's a neat version of the old Mold-Art rubber mask ad found in abundance in late 1940's comic books. I stumbled upon this one recently while flippin' through some of my golden age romance comics, and to be honest, I'm not sure I've ever come across this particular one in color before, (though I have seen it in black and white.) I have also seen color variations of it with the monkey, the idiot, and the clown mask in that glorious center illustration of the "mystery man" pulling some hilarious "monkey shines" on the gang-- but never in color and while masquerading as SATAN!
I totally wish I knew about this ad when I was putting my DEVIL TALES book together a few years back-- I would have most certainly included it!