What is it about French design that is so unmistakable? When I spied these plates across a crowded table full of vintage merchandise at The Elephant's Trunk Flea market a couple of weeks ago, I thought they might indeed be French. That was my first thrill. The second, was the unbelievable price. Five dollars! for four salad size plates, and three bowls. Congratulations to me! And congratulations to Mr. C&C for schlepping them home all in one piece! I'm showing them off today on top of the…