That would put it as probably shipping in mid-1919. That's why there are no S&W logos. S&W dropped stamping logos during WWI and didn't resume until sometime in 1920.
This gun has a seldom-seen (but not rare) variant of the rear sight assembly. The sight leaf (or spring) is sprung upwards. The screw in the rear pulls the rear sight leaf down, for the elevation adjustment. On all the other variants, the sight leaf is sprung down, and the adjustment screws push it up.