"The serial number of this gun (my Grandfather's passed along by my Father) is 25148. It is marked US Army Model 1917 on the butt of the stock along with the S/N, and under the barrel is marked "United States Property". I would love to know about when this gun was manufactured. The bluing is mostly gone, and I think my Dad cleaned it with steel wool (ouch) but it is tight and still fires well! Thanks very much.
Jim"
Production of this model began September 6, 1917 at serial number 1 (in a separate sequence from other N-frame S&Ws of the era). S&W was producing about 5,000 revolvers per month, suggesting your revolver was likely made around February of 1918.
A new building was completed in 1918 to increase production. From Sept 13, 1918 to the end of the war the U.S. government, dissatisfied with the speed of production, took control of the plant. Output increased from 5,000 to 14,500 revolvers per month. Total production during WW I was 163,476 revolvers. Some had not yet been delivered when the war ended and were sold commercially.
Fine old guns!