I believe the pre-WWI K-frames had the large S&W logo stamped on the sideplate, S&W stopped stamping logos during WWI, small (dime size) logo stamp on frame began in 1920, continued until 1937 when large logo stamping on sideplate began again. Unsure that applied to all models. IF (big if) the 202xxx SN is correct, that would date it about 1913, when the large sideplate logo was being used. Of course the biggest problem is that it has the post-1921 MADE IN USA frame stamp. All those so-stamped until 1937 should have had the small logo stamp, but this one does not have it. But that does not negate a theory that the gun was made in 1937 or later, and if so, the SN should be no lower than in the mid-6xxxxx range. Something else to consider is why would the gunsmith (or whoever did the work) deliberately stamp 202xxx on the butt and cylinder if the true SN was something different? Why not just use the factory SN?