I'm not surprised you haven't seen one. They were manufactured circa 1990-1998. There were not a lot of them made, although I do see them from time to time at gun shows and in used pistol cases. There was a 3" version that is even more scarce. Mine was an ankle piece back in the day when my duty pistol was a 9mm 3rd Gen S&W. It was semi-retired when I bought a similar but much lighter Model 342. I really like the 342 and I carry it to this day, but I always wished S&W would have offered a version of that revolver chambered for the 9mm.
HRF