OK, we need to stop believing SCSW for the production dates. All Jim and Rick did was use Roy's early tables. We now know those are off a little. Roy did us a great favor this spring and printed the ship dates of the first few hundred K22s in the post war. We'd apparently amused him but we were a real pain. So to head off the controversy, he just published the source material he uses.
S&W didn't ship guns in numeric sequence. He's been saying that for years and we were too hard headed to believe him. But we now know some guns actually did ship in 1946, but most we figured were that year just weren't. I've lettered my 2 early guns and both K155 and K166 shipped in 1947.
So when the 4th and eagerly awaited SCSW comes out, most of us here will lobby for slightly improved date tables, and an even stronger disclaimer about tying serial numbers to shipping dates. There is a simple rule you can hang your hat on. If the date is important to you, pay the money, wait the time, and get your very own factory letter. Its a lot more accurate than our guesses, which are generally accurate to within 2 full years.