The 042 predates the production 442. The parts for these were intended for early production 642, but were rejected for cosmetic reasons. One of the big gripes was that the color of the clear-coat annodized aluminum frames did not match up suitably to the stainless steel parts. (Clearly, S&W backed off of this in later production lots of the 642.) Someone got the bright idea to refinish the surplus aluminum frames and stainless parts in black, and voila, the 042 was born.