That's a beauty in rare original condition! That serial # and features indicate your gun was most likely assembled and shipped not longer after August 1923.
• Prior to WW I, .22/32 Heavy Frame Target models were supplied with two screw extended target stocks as standard.
Above serial number ~258000 (right after WW I), the standard HFT stocks were replaced with Regulation Police stocks on a rebated grip frame, at first with recessed gold plated brass medallions in the late 'teens. Checkered two-screw extension target stocks with gold plated brass medallions in ‘dished’ stock circle tops were optional after WWI until 1920 on I frames, and w/o medallions) until change order 2/11/1929 reinstated medallions; flat silvers.
By ~1920 Reg Police stocks were changed to rounded, convex tops* w/o medallions. And then the two screw target stocks with convex stock tops and also w/o medallions were still optional** until they became standard again by order Aug. 29, 1923.
*All walnut stocks on all models have convex tops (not dished) from 1920 forward except for the much later “Classics” models.
** Target stocks on a rebated grip frame are a dead giveaway that they were likely special ordered during the period that RP stocks were standard on HFTs, or if the serial # doesn't match the gun, swapped aftermarket.
• One line “MADE IN USA” ordered in May 1922 but did not get stamped on new frames until sometime late 1922 –early 1923 once a new batch of frames was ordered for production, and because of all the existing unstamped frames already in process. It was in use until the April of 1948 change order to replace it with the 4 line address. And beware of 4 line addresses on factory re-finished revolvers; for awhile in the early 1970s, S&W was re-stamping the one line address with the 4 lines until Roy Jinks put a stop to it.
• Aug. 29, 1923 change order, replaced .22/32 HFT sq butt RP convex top stocks, returning to 2 screw target stocks as standard but with convex tops, and w/o medallions. And from the original Paine bead* front sight w/U-Notch to a Patridge w/square notch rear. The next day, the same was ordered for the 32 & 38 Target Models and the Single Shot Model as well, S&W 1857-1945 N&J pg. 235.
* Is a style designed by "Chevalier" Ira Paine, a renowned pistol shooter of the 1880s era.