1920, or maybe 1921 if it languished in inventory for a few months.
What a beauty!
Note that the frame is unmarked on the right side. This is a couple of years before the MADE IN U.S.A. stamp was first applied.
I'm not sure about the S&W logo. There was a short period after WWI when the name SMITH & WESSON could be seen on the barrel but there was no S&W logo stamped on the frame. If your gun has the stamp, it would be small and on the left side.
That one is really nice!
Not heat treated. Don't shoot +P in that.
