For the record, for the Nth time, there are no 1902's with a square butt. In the k-frame
series, anything with a round butt is a Model of 1902. Anything with a square butt is
a Model of 1905. If you don't believe this, read the catalogs carefully.
All of this confusion comes from the fact that the Model of 1905 was introduced at
serial number 58000, well before the 5th frame screw at serial number 62450.
What this does mean is the the Model of 1905 is identical to the Model of 1902 1st change. This is the source of the problem. The two otherwise-identical models are
now out of sync, by one engineering change.
What this does not mean is that the Model of 1902 goes away. It does not. The round-butt model co-exists with the square butt model for many decades, and in fact, its the square-butt model that went away about 10 years ago, or so.
Regards, Mike Priwer