"FWIW it's my understanding that the no-lock 442's now being produced by S&W's are indeed 442-1's. Per the SCSW, the engineering change which accompanied the 442-2 designation was adding the internal-lock system along with some internal MIM parts. So it stands to reason that a new no-lock would revert back to the 442-1 designation."

It does stand to reason, however, that is not always S&W's policy.
My M442-2 does not have a lock. It was made in about 2009.

Best,
Rick