I don't have any books with me here to look up the history, but I just found where a 622 sold on gunbroker for $170.00 last month. I think these are normally $150 to $175 guns.
They made these pistols as a 422 622 and 2206 in different materials. I have a 6'' 422 and it will clean easy and cycle anything you feed it. At www.graybeardoutdoors.com they have info on these under rimfire handgun. It's an informative site also.