Just heard back from the seller - he got it from "Piece of the Past". That's all I needed to know. I thought the ink looked a little dark and familiar, as well. I've gotten 2 of these same ink style from Piece of the Past a long time ago when I didn't know any better. All I can say is ...whew!
I took one look at it, before I read any responses, and wasn't convinced. Vibe is off from the numerous 3 Stooges signed pieces of all eras that I'm familiar with.