Don, they were limited runs.
IIRC they only made 2000 of these


Only 500 of these


And I only know of 2 of these.


I just spoke to a former S&W rep. this past weekend and he tried to find out the exact numbers of the last one I posted. He didn't have any luck either. As much as I hate to have a new gun "lettered" it may be the only way I'll ever find out.