I remember one of the first undercovers- the first year they came out-before any other models. It had the grips made from the famou Charter Oak which had recently keeled over. At the time, this was advertised as the smallest .38 snub in existance and, being smaller than either the Smith J or the Cold D, it probably earned the title.
This one would misfire consistently on one chamber and the theory was that that one was contersunk too deep. Others, I've seen since have been in various stages of not working right. I do recall a .44 bulldog from the first run that functioned properly.