I just bought this Comoy's Criterion because it was only 20 bucks and I find the shape amusing. I assume it's kind of a one-off shape since there's no number. I can't find anything about the Criterion line except a few photos. The stamping is later, but I'm holding out hope that the "C" is the pre-Cadogan three-part one (can't really tell from the seller's photo). I gather that Criterion was a sort of catch-all line for various partially blasted "whimsical" shapes, but I'm curious to know more if anyone is familiar with it.