S&W production numbers are always hard to come by, as far as I know the CS45 and CS9 are still being made on special orders. The CS40 would be the low count one, they stop making them several years ago.
I am glad I purchased a CS40 not too long ago LNIB. It is a work of art indeed. Looks like investment values in S&W firearms will outbeat the S&P 500 or the Dow Jones!